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3rd Grade Math Compilation



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Wow we are gonna learn so many cool

things on this home school pop video all

right what's the first thing we should

learn how 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 to 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 x - x 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 - how many yeah - so it reads

two times - to figure this out we are

going to skip count by 2 - 4 that means

2 times 2 equals 4 if you have two bikes

that means you have four wheels - two 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 two wheels

so the first number we write down is the

number two that's the number in each

group we're gonna put the time symbol

there and count the number of groups one

two three four so it's two times four

this is so much fun

this is multiplication now let's skip

count to get the answer two four six

eight 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 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 five ten fifteen five

times three equals fifteen 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

[Music]

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 11 equals zero and zero times

1000 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 100 times one equals 133 times one

equals 33 if you flip them the answer

stays the same

one times seven equals 7 one times 100

equals 100 one 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

[Music]

so the two tricks have been if you

multiply any number by zero you always

get zero and if you multiply any number

by one 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 oh this little

baby's putting together a little craft

you know oh it's so great I just love

that that's that's so good wait a second

that papers from that book isn't it ok

this is see this is this is not an

approved arts and crafts activity right

now ok we're gonna have to take care of

this but first let's learn about

- vision 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 yeah 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 your 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

snack 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 uh-huh 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 one three divided by three equals one

notice right here is the division sign

this is what it looks like when you see

that sign you could just save divided by

so this reads three divided by three

equals one 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 uh-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 oh my god like

secrets this is super cool okay so just

look around all right make sure it's

cool clear are you it's time for

division facts the first fact is this

you can never divide by 0 it's true you

can never divide by 0 even if you're a

rule breaker and you're like I'm gonna

do it you still can never divide by 0 in

fact if a teacher ever gives you a test

and you see a problem where you have to

divide a number by 0 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 0 you can never divide

by 0

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 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 two it not

interesting ten divided by two equals

five and ten divided by 5 equals two 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

[Music]

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 here's our friend Fred we heard

that he just took up the harp he just

started playing the harp Fred we can't

we can't hear it we're having audio

problems with Fred right now Fred you

look so happy playing we we can't hear

you ok you gotta you gotta wear my curse

up that we can't hear the music he

doesn't even know isn't that nice

you know fred is just plucking away he's

having a good time you know callek we're

having a good time right now with these

learning videos and next we are going to

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 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 needs 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

one a line and the two that is the

fraction one-half 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 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 in 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 bits 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

hey PD I know I know I heard about your

plane you know it's a cool plane you

know and and it's it's neat I don't know

if it flies or you you look pretty

confident that it's gonna fly which is

cool yeah I see you hello oh yeah thanks

for waving thanks for saying hello you

know we're actually in the middle of

learning we're learning a lot of new

cool things right now so I actually do

have to go hi you're still waving okay

we're gonna go because now we need to

learn about perimeter all right let's

show you how fun this is imagine that

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 Adam 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 centimeters 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 10 plus 10 plus 10 that's three

tens what is that equal yeah 30 awesome

the perimeter of this triangle is 30

centimeters remember cm is an

abbreviation for centimeters 30

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 for 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 eight 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 so from 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 you have been doing a great job

just like Mike who's doing these

push-ups you know he knows it's

important to stay fit and exercise it to

stay healthy and you're like exercising

your mind right now which is super cool

and 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

the letter X is the Roman numeral that

means two hen so when you think one it's

an eye you think five it's a fee 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've 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 ten 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 I 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 3 let's try this one what

number do you think this is we see 2 X's

and 10 so 10 plus 10 equals 20

great job this is the number 20

[Music]

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

ten plus five fifteen 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 four and the

number four is represented with an eye

and a V and eyes before the V because

four is one less than five which is V so

remember with four it's IV with nine

it's similar except with the X 9 is eye

X X is 10 and I is just before it so 9

is AI X

okay 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 you completed the

video that is so impressive

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learning learning is so cool