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2nd Grade Math Compilation



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wow we are gonna learn so many cool

things on this homeschool pop video

alright what's the first thing we should

learn how about perimeter all right

let's show you how fun this is imagine

I'm a racecar driver right and don't

make fun of my car okay this is this is

a perfectly good car to do a racin right

it's very fast it's it's got the bells

it's got the whistles it's a great race

car okay laughing at okay now imagine

this is the race car course that I'm

driving on right it's going around and

oval it's going around a shape if I was

wondering how far is it around the track

what's the distance around the shape

then I would need to know the perimeter

the perimeter is the distance around a

shape wait wait wait what is the

perimeter the perimeter of a shape is

the distance around a shape and it's

easy to find you can find the perimeter

of a shape by adding all of the sides

that will tell you what the distance

around the shape is great now let's

practice finding the perimeter look at

this triangle what is the perimeter of

this triangle okay first we need to know

how long all of the sides are then we

can figure out the perimeter with this

triangle all three sides are the same

length so how long are they let's

pretend we measured it and each side is

10

meters now remember to find the

perimeter of a shape we need to know the

distance around the whole shape so we

just add the sides together

what's ten plus ten plus ten that's

three tens what is that equal yeah 30

awesome the perimeter of this triangle

is thirty centimeters

remember cm is an abbreviation for

centimeters thirty centimeters is the

perimeter of this triangle okay let's

try this one what is the perimeter of

this square first we need to know how

long all the sides of the square are

then we can figure out the perimeter of

the square okay so this is a square it

has four sides and all four sides are

the same size let's pretend we measured

it and each side is one yard

remember yd is an abbreviation for the

distance of a yard each side is one yard

remember the perimeter is the distance

around a shape so we'll need to add all

of these sides up okay what's one plus

one plus one plus one yeah or the

perimeter of this square is four yards

the perimeter remember is the distance

around a shape if you were to go around

this entire square it would be four

yards okay this is the final one what is

the perimeter of this rectangle well

first we need to know how long all the

sides of the rectangle are then we can

figure out the perimeter remember a

rectangle has four sides and two of the

sides are shorter than the other two

sides with this rectangle let's pretend

we measured it at one meter on the short

side and three meters on the longer

sides okay remember to get the perimeter

we have to add all of the sides together

so we're going to be adding four numbers

together again to make it easier we're

gonna group the smaller numbers together

and then cook the larger numbers in our

equation what's one plus one plus three

plus three those are all the sides

what's one plus one plus three

plus three yeah eight that means the

perimeter of this rectangle is 8 meters

Wow we told you it was gonna be fine oh

it's such a blast finding the perimeter

the perimeter is so much fun to find

it's like a game remember you can find

the perimeter of a shape by adding all

of the sides and the perimeter of a

shape is the distance around a shape now

you know how to find the perimeter of

something the perimeter is the distance

around a shape I can find the perimeter

of this tablet right all I would need to

do is measure each side and add them

together and I would find the perimeter

but right now I got to find an internet

connection there's no Wi-Fi out here

there's no reason to be in the desert I

need water it's not this doesn't make

any sense

I'm gonna go you go ahead and find

perimeter enjoy the perimeter is the

distance around the shape go have fun

thanks for watching we are so happy to

have you with us I mean you are so

awesome you really are oh you like my

poster here mr. whiskers poster you know

it's pretty cool pretty cool you know

it's a pretty cool poster pretty cool

cat - I wonder what he would like to

learn about next if he would learn from

one of our videos what would he like to

learn next hmm how about hmm let's learn

about fractions fractions are so awesome

and so much fun

many of you think so too a couple of

weeks ago we set up a poll on our

channel and many of you voted we're

fractions as our next math video that's

really awesome thanks everyone for

voting and don't worry

we'll make the other two videos too

later on but this is all about fractions

all right well let's start here what is

a fraction when we say the word fraction

what do we mean what is a fraction well

a fraction is something that shows parts

of a whole let's say there's this lady

named Cindy Cindy has a pizza which is

great she loves pizza so yummy pizza but

then her friend chomsky arrives you

remember chomsky likes pizza too and

he's a little bit hungry so maybe Cindy

isn't gonna eat the whole pizza now

maybe they're gonna split it what do you

think so they split the pizza in half

each of them get one half of the pizza

that neat then everyone has pizza each

of them have one half of the pizza they

split it right down the middle now

remember a fraction is something that

shows parts of a whole so here is what

the fraction looks like a 1 a line and a

2 that is the fraction 1/2 each of them

Cindy and chomsky get one half of the

pizza so this is one half it's a very

important fraction because we use it all

the time

now you might be wondering what do the

numbers mean and how does it show one

half

well the bottom number shows the total

number of parts the top number shows how

many parts we are talking about I'm

pretty simple let's go back to our

example there are a total of two parts

to the pizza so there's a two on the

bottom and Cindi just gets one part

that's the part we're talking about so

Cindy gets just one half of the pizza

she doesn't get the whole thing she gets

just one part she gets one half the

bottom number of a fraction is called

the denominator the denominator is the

total number of parts the top number is

called the numerator the numerator tells

us how many parts we are talking about

in this case cindy is having one part of

the pizza the other part of course is

going to chomsky let's try this let's

say there's another pizza and this pizza

has four parts the number four is the

denominator because there are four

pieces of pizza four parts let's say

Kelly shows up and wants to have one

part of the pizza one piece of the pizza

the numerator or the top number of the

fraction is the number one because Kelly

is having one part or one piece of the

pizza

Kelly is having one fourth of the pizza

pretty simple pretty fun fractions are

awesome

[Music]

now we're gonna need your help help us

figure out what fraction is it huh

what fraction is it Wow we're gonna have

a great time let's say we have a group

of five sports balls one is a basketball

the other four are soccer balls let's

figure out what fraction of the balls

are basketballs what fraction of the

balls are basketballs so we know a

fraction has a line in the middle and

the top numbers the numerator and the

bottom number is the denominator the

denominator shows us the total number of

parts or units how many sports balls are

there yeah five five is the denominator

good job now remember we're asking for

the fraction of sports balls that are

basketballs so how many basketballs are

there

yeah just one the number one is the

numerator so one-fifth of the sports

balls are basketballs one-fifth great

job let's try this final example let's

say there are five pets five pets

two of them are dogs and three of them

are cats what fraction of the pets are

cats huh that's a good question what

fraction of the pets are cats remember

here's what a fraction looks like it's

got a line in the middle with the top

number being the numerator and the

bottom number is the denominator so the

total number of pets is five what number

is the denominator what number goes on

the bottom yeah

five five is the denominator it tells us

the total number of pets remember we're

asking for the fraction of the pets that

are cats how many cats are there yeah

three so what's the numerator yeah three

three is the numerator three fifths of

the pets are cats Wow that was so cool

but none of those cats are special to me

as you mr. whiskers not even a fraction

of my heart belongs to my whole heart I

love you mr. whiskers a fraction is

something that shows parts of a whole

the top number of a fraction is the

numerator how many parts we are talking

about and the bottom number of a

fraction is the denominator the total

number of parts oh wow look at the

homophone cow homophone cow huh

homophone cow he you just walk you just

gonna ignore me okay so you're upset

that we haven't included you in other

videos what do you call this you know

you're in a compilation video that's

cool too all right I need to talk to the

homophone cow but in the meantime let's

learn about multiplication you're gonna

learn how to multiply and if that sounds

really scary or if that sounds like a

difficult thing it's just because you

don't know how to do it yet once you

learn the game once you learn the

process it's fun it's awesome

you see multiplying is like being a

detective you're cracking a code which

is so cool you're solving mysteries like

legit mysteries like I'm I'm in an

office building right now there's a cake

behind me for some reason I'm looking

out right now are you guys that I see

that you're like and once you learn it's

just a game so buckle in for the fun and

the learning let's say you have two

bikes and for some reason they look the

exact same and somebody wants to give

you an air pump

they ask a simple question how many

tires do you have to take care of to

figure that out we're gonna use

multiplication we're gonna play the game

it's gonna be awesome

okay so here is how multiplication works

so we put the number that's in each

group and then we put this X which means

x and then the number of groups so that

tells us how many times that number is

going to show up and then we add them

all together and you've got your answer

then that cool and just a side note to

work there has to be the same number in

each group now remember we're trying to

figure out how many tires you have to

take care of if you have two bicycles

all right now we have the wheels under

each bike each bike has two wheels one

two so we write down a two each bike has

two wheels remember the first number we

write down with multiplication is the

number in each group then we write an X

this X means times two times it's the

symbol of multiplication all right the

second number we write are the number of

groups you can see them here how many

groups do we have of two how many yeah -

so it reads two times two

[Music]

to figure this out we are going to skip

count by 2 to 4 that means 2 times 2

equals 4 if you have two bikes that

means you have 4 wheels to 2 x is 4

remember this is how multiplication

works the number in each group times the

number of groups equals your answer of

course to work there has to be the same

number in each group all right let's

take this to the next level let's say

someone has 4 bikes and here are their

wheels you know how to do this now each

bike has 2 wheels so the first number we

write down is the number 2 that's the

number in each group we're gonna put the

time symbol there and count the number

of groups 1 2 3 4 so it's 2 times 4 this

is so much fun this is multiplication

[Music]

now let's skip count to get the answer 2

4 6 8

[Music]

eight is our answer there are eight

wheels two times four equals eight this

is how multiplication works we put the

number in each group times the number of

groups and we get our answer you're

getting the hang of it all right let's

try this one let's say you buy three

packs of trading cards let's say each

pack had five cards in it huh that's

pretty good amount so three packs of

five cards how many cards did you get in

total it's a really great question

sounds like we're gonna need to multiply

so each group has five so that's the

first thing we write down the number in

each group that's five put the

multiplication sign which is that X

which means times five times how many

groups are there one two three

so the second number is three five times

three what's five times three we're

gonna skip count to find out 5 10 15

five times three equals 15 you have 15

trading cards all right this is how it

works

you take the number in each group times

the number of groups and you get your

answer

now here are some multiplication tricks

that are gonna be really sneaky ways

that you can figure out multiplication

problems really really quickly here's

the trick if you multiply any number by

zero you always get zero always you

always get zero here's an example five

times zero equals zero when you have

zero groups of five that means you have

zero there are none whenever you

multiply any number by zero you always

get zero 100 times zero equals zero

[Music]

even if zero is the first number in the

equation you still always get zero when

you multiply by any number for example

zero times eleven equals zero and zero

times one thousand equals zero but if

you multiply any number by zero you

always get zero oh this has been so much

fun here is the next trick if you

multiply any number by one it stays the

same look at these seven times one

equals seven one hundred times one

equals 133 times one equals 33

[Music]

if you flip them the answer stays the

same 1 times 7 equals 7 1 times 100

equals 100 1 times 33 equals 33 honestly

the order of the multiplied numbers does

not change the answer if you were to

flip the number of groups and the number

in each group you would still get the

same answer though we still recommend

this way so simple the number in each

group times the number of groups to get

your answer so the two tricks have been

if you multiply any number by 0 you

always get 0 and if you multiply any

number by 1 and stays the same

the final multiplication trick is to use

multiplication tables they come in all

shapes and sizes but they are all

helpful especially as you're first

learning how to multiply here are some

examples of multiplication tables

there's a table for all of the numbers

from 1 to 10

some kids memorize tables like these so

that they'll know right off the bat in a

moment what an answer could be for

certain multiplication problems this is

how multiplication works the number in

each group times the number of groups

gives us our answer it's hard work you

know a lot of times learning can be hard

work too but we hope that these videos

are really helpful make learning fun so

that learning is hard like pushing this

cart oh my goodness all right what's the

next thing we should learn about let's

learn about three-dimensional shapes

gonna be awesome love the 3d shapes a

lot of people know the 2d shapes you

might not know the 3d shapes you're in

the right place before we get started

just dance here real quick this is

really cool music dancers dance I dabble

and dancing all right can somebody turn

that music off for me seriously I can't

teach like this I can't teach with this

music going on yeah I feel like I'm in a

candy shop listen to music please thanks

so here they are our old friends the 2d

shapes you're familiar with these you

know you're familiar with the circle the

oval the triangle the Pentagon the

trapezoid the hexagon the square the

rectangle the parallelogram in the

octagon and these are all are our shapes

our 2d shapes you know but these are all

family friends of ours we don't want to

just forget about these and before we

look at 3d shapes it's really important

for us to look at these shapes again

because these are old friends so we're

gonna look at each one of these one by

one just to make sure you know who they

are before we learn all these new shapes

this first shape doesn't even need an

introduction it's the circle the circle

that round figure it's awesome we love

this shape it's one of the first ones we

ever learned the circle this next shape

is one of the stretchy shapes the oval

it's like a circle got stretched out

it's elongated it's a tremendous shape

the oval

here's another familiar shape the

triangle three sides

we love the triangle the triangle is

great the three-sided friend three sides

a triangle wait I keep saying we love

the shapes I mean we like the shapes but

do you love the shapes do I love the

shades Andy take it easy here huh

alright let's keep going ah the square

of four sides all equal you know the

squares good the square so good shape

you know yeah

sometimes you just need a square

sometimes you just need a square here's

the rectangle the rectangle is longer

than the square because not all four

sides are equal the rectangle I know I'm

weird the middle something here but I

have to show this okay

so what do you call a hamster with the

top hat

Abraham stir Lincoln I digress the

trapezoid a cool shape with two of the

sides being parallel to each other in

the parallelogram another four-sided

shape both pairs of sides are parallel

to each other and finally the Pentagon

with five sides the hexagon with six

sides and the Octagon with eight sides

what awesome

shapes so let's go ahead and do a quick

2d shape quiz I need your help I want to

see if you really learn these if you

really know these before we get into the

three

so help me out here we're gonna have an

awesome time wait my birthday Oh what

type of shape is on the top yeah a

circle what type of shape is in the

middle a square awesome okay now what

shape is on the bottom of course a

triangle

awesome job now we've got more this is a

little trickier which shape is in the

middle yeah

a trapezoid which shape is on the right

the Pentagon good job and which shape is

on the left yeah the square

now try these which shape is on the

bottom yeah

the oval which shape is on the top yeah

the parallelogram which shape is in the

middle all right the rectangle great job

all right the last one which shape is on

the left yeah the hexagon which shape is

on the right gray the octagon and which

shape is in the middle phenomenal the

Pentagon all right we're ready to learn

the 3d shapes we're gonna learn how to

identify the three-dimensional shapes if

you struggle through the quiz you might

want to watch the first part of the

video again otherwise let's get started

so as we're starting out it's important

to remember what makes a 3d shape a 3d

shape

there's an old rhyme that says 3d shapes

are fat not flat and you can see that

with the sphere which is a 3d shape

we're about to learn and the circle the

circle is flat but the sphere is 3d it's

three-dimensional

all the shapes are like that so let's

learn all these 3d shapes so the first

3d shape we're going to learn is the

sphere the one that we just mentioned

the sphere is the 3d version of the

circle it's perfectly round

there are spheres all around us one of

the spheres we see all the time are

balls like this soccer ball a soccer

ball is a sphere it's perfectly round

it's a 3d circle it's a sphere

you know this sphere yes it's the earth

it's where we live our planet is a

sphere how cool is that our own planet

is a sphere perfectly round it's a

sphere in this picture we have two

Spears can you spot them yeah the two

spheres are the two bowling balls

perfect round spheres spheres are all

around us here we have a group of three

spheres and you can count them right now

one two three spheres all together the

shape of a ball a sphere perfectly round

well there you have it the sphere what a

cool 3d shape to start with it's round

they're examples all around us and it's

just so cool and you know what the 3d

shapes are gonna get even better

our second 3d shape is the cone the cone

is a really cool shape with a circle as

the base or the bottom and it all comes

up to one point called a vertex here's

an example of a cone I think we all love

the ice cream cone if it doesn't have

any ice cream inside and you flipped it

upside down you'd be able to see the

circle base and it all comes up to one

point called the vertex

here are two cones a red cone and a blue

cone and you can see both cones have

that circle base and all comes up to a

vertex what wonderful cones have you

seen these before

they're traffic cones here are many

cones I didn't count all of them but

there's a lot and they're wonderful

wonderful cones so that's our second 3d

shape the cone a wonderful cone with a

great circle base it all comes up to one

point called the vertex how awesome is

that

our third 3d shape is the pyramid

I love the pyramid the pyramids great it

comes up to one point just like the cone

except the base is a square and the

sides instead of being smooth they are

triangles okay like these are awesome

these are so cool the pyramids of Egypt

you see that they have the triangle

sides and the bottoms of these pyramids

are square they're awesome examples of

the pyramid this is a pretty cool

pyramid it's a decoration that you plug

into the wall but it's a great example

of what a pyramid looks like the bottom

or the base is a square and there's the

triangles on the sides how cool is this

here's another pyramid it's made of

glass there are so many decorations and

things around maybe even your house that

are sheep like a pyramid because

pyramids look so cool people love

putting them everywhere

there you go I mean you know the pyramid

it's a shape you know you see a lot of

them around they've got the square

bottom or base and that the triangles on

the sides and all goes up to a vertex

it's a classic shape it's pretty awesome

our fourth 3d shape is the cylinder now

a cylinder is easy to spot because it's

got a circle on the top and a circle on

the bottom and it's smooth all around

here we have a can of soup and it's a

cylinder it has a circle on the top a

circle on the bottom and it's smooth all

around all cans and most jars are

cylinders here we have three cylinders

there candles and can I tell you a

secret

most candles are cylinders - right -

crazy and - awesome here are two more

cylinders are you kidding me

are you kidding me even batteries or

cylinders cylinders are seriously

everywhere a circle on the top a circle

on the bottom and smooth all around I

mean really the cylinder is everywhere I

mean you know the circle on the top

circle on the bottom smooth all around a

cylinder like what in the world do you

have to be everywhere okay the next 3d

shape is the cube the cube is the 3d

version of the square it has six sides

or faces that are all squares

here we have to dice dice are in the

shape of a cube so these two dice or two

cubes they have six sides or faces that

are all squares here we have many cubes

these are cubes that are made out of

wood

each of them have six sides or faces

that are all squares here are seven

cubes of ice have you ever had a warm

drink and you need to put ice in it it's

awesome because it has this great shape

the shape of a cube six sides or faces

all squares I mean there you go

the cube right the 3d version of a

square and it's got squares all along

the sides right there six sides or faces

all squares and I don't know I think

it's pretty cool shape our final 3d

shape is the rectangular prism the

rectangular prism is the 3d version of

the rectangle it has six sides or faces

that are all okay an awesome example of

the rectangular prism are bricks and

here we have four bricks which are four

rectangular prisms the 3d version of the

rectangle

you may have seen this in your classroom

or in your home it's a Kleenex box and

the Kleenex box is a great example of

the rectangular prism it's got six sides

or faces that are all rectangles okay so

the secret is most boxes are rectangular

prisms so here's another rectangular

prism and it's a box and it's a shorter

box but it still has rectangles all

around and it's rectangular prism what

else can we say it's a cool shape the

rectangular prism is the 3d version of

the rectangle it has six sides or faces

that are all rectangles and it's just a

neat shape to have around I think I mean

you know yes so let's review

[Music]

pyramid

[Music]

[Applause]

cylinders

spear

cylinder cones

[Music]

you're made

[Music]

rectangular prism

[Music]

Speirs

let's do some more on the top here we

have cubes we can tell that because it's

the 3d square it has six sides or faces

each of them our squares is pretty cool

do you remember what shape these bricks

are yeah a rectangular prism they are

rectangular prisms they're the 3d

versions of the rectangle at the top we

have a cone a cone it's got a circle

base on the bottom and all comes up to

one point called of vertex do you

remember the shape here on the bottom

these are three cylinders they have a

circle on the top and a circle on the

bottom and it's smooth all around you're

doing such an awesome job seriously it's

so cool so what's this top shape do you

remember yeah it's a pyramid a pyramid a

pyramid has a square base it comes up to

one vertex or one point and has

triangles as besides

[Music]

all right do you remember this last

shape here on the bottom yes it's the

sphere the sphere which is the three the

circle and we started with it and we're

ending with it and it's so awesome

[Music]

Hey whoa okay first of all elephants

don't drive okay elephants can't get a

driver's license and he's driving on the

grass he's driving on the grass you're

gonna row in the law okay let's go

all right this is out of hand okay I

don't tell you can do what you can't do

what you can't drive all right oh my

goodness ha right next we are going to

learn about Roman numerals which is a

different way to write numbers and it

was used a long time ago in ancient Rome

and it's been used since then and you

can think of it almost as a secret code

way of writing the numbers it's pretty

simple to learn and we're gonna go

through that the first Roman numeral

we're gonna learn is the Roman numeral I

and I is 1 i equals 1 so if you see an

eye with a Roman numeral it's 1 the

letter V is the Roman numeral that means

5 and the letter X is the Roman numeral

that means 2 hen so when you think one

it's an eye you think 5 it's a V and if

you think 10 it's an X

so that's it just those three I it

almost looks like a one that's how you

can remember that I is a one I is the

Roman numeral for one a V is in the

number five when you spell it out the

number five you see that right there

it has a V in it so when you think of V

you know oh you know what there's a V in

the spelled out number five so V has to

be 5 now 10 is accent you can't think of

anything that could remind us of that so

there is no memorization thing just when

you see the eggs it's Ted and that's

just what we're gonna have to do okay

one last time here I just want to make

sure you get it there's only three I is

the Roman numeral for one V is the Roman

numeral for five and X is the Roman

numeral for ten and you got to

understand that so that we can start

playing kind of a game of putting them

together and making numbers other than

just one five and 10 so let's get

started so let's practice putting these

Roman numerals together what number do

you think this is you see two eyes and

eye is 1 so the answer is 2 2 eyes is

the number 2 what about this one what

number do you think this is

there are three eyes yeah it's the

number three let's try this one

what number do you think this is we see

two x's and x equals 10 so 10 plus 10

equals 20 great job

this is the number 20 whoa this one is

so cool okay an X and a V what number do

you think this is the V is what number

five awesome so what is 10 plus 5 15 oh

thanks so much for helping out now that

we've looked at how to put some of these

together I want to tell you about two

special numerals that are a little bit

different and so you're gonna have to

just remember these on their own the

first is the number 4 and the number 4

is represented with an I and V and I is

before the V because 4 is one less than

5 which is V so remember with four it's

I V with 9 similar except with the X 9

is I X X is 10 and I is just before it

so 9 is i X ok that was really cool

thanks for hanging out and learning

those with me but we're not done we want

to go through all the numbers up to 30

just using the numerals and I want to

see how much you've really learned so if

you'll do me a favor as the numerals go

up I want you to say

the numbers along with me and we can

practice together sound good all right

let's get started

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24 25 26 27 28 29

and 30 well there you have it a new way

to write numbers Wow

mom you're doing such a great job in

your race I had no idea you were an

athlete okay I mean with all that cloth

wrapped around you're doing great you're

doing a great job just like these kids

are doing a great job learning in fact

how about this the next thing we're

gonna learn about is division division

is such an awesome thing to be able to

do and you're gonna have it all figured

out you're gonna learn how to divide in

this video and we're gonna start off

with a story there's this kid named

Ethan and Ethan loves carrots

he loves carrots so much he loves to

snack on him he loves when he gets to

eat them their crunchy their tasty

my carrots are awesome in fact I'm

literally eating a carrot right now as

I'm speaking carrots are great for your

skin

carrots are great for your eyes are

amazing you're great snack and Ethan

loves them well Ethan has two friends

over Kevin and Chloe and they start to

get hungry of course they all love

carrots because carrots are like the

perfect now in Ethan's house there are

only three carrots they're just three

carrots we are going to have to divide

the three carrots amongst the three kids

so let's figure this out how many

carrots does each kid get do you know

uh-huh each kid gets one carrot pretty

simple right three carrots three kids

each kid gets one carrot hey did you

know we just did division aha we just

did division division is pretty simple

you see division is splitting a number

up by any given number that's it just

splitting a number up let's look at our

story again

there were three carrots and we divided

those three carrots by 3 because there

are three people right the three kids

that love carrots and the answer of how

many carrots each kid gets is 1 3

divided by 3 equals 1 notice right here

is the division sign this is what it

looks like when you see that sign you

could just say divided by so this reads

3 divided by 3 equals 1

let's try another example of division

let's say there are eight presence a

presence and there are four women and we

want each of the women to get the same

amount of presence as the other women

because we want it to be fair notice the

division sign we are going to divide or

split up eight by four remember to

divide us to split up let's split these

presents up into four equal groups one

two three four all right how many

presents does each woman get ah huh two

each woman gets two presents isn't that

cool

division is so much fun and it's so easy

remember division is splitting a number

up by any given number that's it all

right now it's time for division facts

we're going to learn some pretty

interesting facts about division and

you're gonna be like like secrets this

is super cool okay so just look around

all right

make sure it's clear all right it's time

for division facts the first fact is

this

you can never divide by zero

it's true you can never divide by zero

even if you're a rule-breaker and you're

like I'm gonna die you still can never

divide by zero

in fact if a teacher ever gives you a

test and you see a problem where you

have to divide a number by zero just

right on the test undefined because

that's exactly what that answer would be

undefined it's impossible kind of like

mr. whiskers math skills does mr.

whiskers do math in his head all day

long who knows his math skills are

undefined we just don't know it's

impossible to know you know mr. whiskers

might know how to do division who knows

undefined you can't divide by zero you

can never divide by zero

if you ever see any division problem

dividing by zero just right undefined

it's impossible it's impossible so just

write undefined the second fact is this

you can write the division sign three

ways uh-huh not just with that

traditional division sign you can write

it like the division sign or you can

write a division problem with the slash

or with a horizontal line for example

look at this 12 divided by 3 equals 4

that's the original division sign the

one that you might see more regularly

[Music]

but here is the same equation written in

a different way 12 divided by 3 equals 4

it's still a division sign but it's a

slash it means the same thing as the

original division sign remember the

division sign can also be a horizontal

line 12 divided by 3 equals 4 that looks

like a fraction doesn't it the line in a

fraction means divided by these are the

three ways that you can write the

division sign pretty interesting all

right

the final fact is this

okay this is so awesome you can flip the

number of groups and the number in each

group and the division problem stays

true for example ten divided by two

equals five and you can flip the two and

the five and it stays true that means

ten divided by five equals 2 in that

interesting 10 divided by 2 equals 5 and

10 divided by 5 equals 2 you can flip

the number of groups and the number in

each group and it still stays true or

look at this 18 divided by 6 equals 3

remember we can flip the number of

groups and the number in each group and

it still stays true so we could switch

the 6 and the 3 and it stays true so 18

divided by 3 equals 6 the 6 and the 3

can be flipped so 18 divided by 6 equals

3 and 18 divided by 3 equals 6

pretty nifty those were some cool facts

you know division is a great time

division is splitting a number up by any

given number it's a lot of fun and we

hope you learned a whole lot in this

video

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