right here right now we are going to

learn something exciting called double

digit addition you may have already seen

our basic addition video in that video

we learned that addition means putting

numbers together we learned about this

lady named Sally who collects golf balls

let's say Sally starts her day off with

two golf balls cool and then she finds

another golf ball so now we get to find

out how many she has in total she had

two and now she's got another one

how many golf balls does she have this

is addition two plus one can you add

those up what's two plus one uh-huh

three awesome let's look at one more

example of basic addition before we get

into the double digit addition let's say

later on in the day sally has five golf

balls and then she finds two more that

are just sitting there just sitting

there so she can add the two golf balls

to the five that she already has

remember addition is putting numbers

together five plus two equals one here's

a hint

you can count these golf balls up and

get the answer yeah seven five plus two

equals seven you are doing a tremendous

job these are examples of single-digit

addition but what if we need to add

bigger numbers

let's say there's this kid named Travis

hi Travis Travis collects these what are

these called uh-huh

marbles Travis collects marbles Travis

had a lot of marbles he had 54 marbles

but today's his birthday and someone

just gave him 21 more marbles Wow and

now he wants to know how many marbles do

I have I had 54 and now I have 21 more

that are in my collection how many

marbles do I have that's the question

that Travis has what's 54 plus 21 now

here's the deal Travis you could count

each of the marbles one by one to figure

out exactly how many you have now but

that would take a long time look at all

of these marbles there has to be a

better way in fact there is there's a

way that is super fast and super fun we

can add 54 and 21 together by doing a

fun trick will turn these big numbers

that are difficult to add on their own

into smaller numbers what you will do is

you will add the numbers to the right

right here which are the ones to make it

easier we are going to block the 10 spot

for right now with this nifty blue

rectangle suddenly this huge big

addition problem has turned into a

simple fun addition game so we add the

right spot the 1 spot together what is 4

plus 1 hmm yes 4 plus 1 equals 5 so

we'll write 5 under the 4 and the 1

awesome job we're halfway done already

[Music]

next we will add the tens together the

10 Spa is to the left the two numbers in

the ten spot are the five and two to

make it easier we are going to block the

one spot with another blue rectangle

because we already added the one spot up

what is five plus two uh-huh

five plus two equals seven so we will

write seven under the five and the two

so what is our answer

what is 54 plus 21 uh-huh you can see it

right here

75 54 plus 21 equals 75 the answer to an

addition problem is called the sum our

sum is 75 it's simple with double-digit

addition you add the right side the ones

together first let's figure out what 30

plus 12 is first what is zero plus two

yes 0 plus 2 is 2 so we'll write a 2

under the right side the ones side we've

almost arrived at our answer already

then we add the left side the tens to

get our answer what is 1 plus 3 yep 1

plus 3 equals 4

so the sum of this addition problem is

42 30 plus 12 equals 42 let's try a

different type of addition problem 33

plus 6 this is an interesting one

because 33 is a double digit number but

the number 6 is a single digit number

but we use the same fun trick as before

first we add up the ones what is 3 plus

6

huh 3 plus 6 equals 9 so we write 9 here

under the ones next let's add up the

tens but there is only one number in the

10 spot so what do you get if you add

nothing to 3 uh-huh you get 3 so what is

our sum yes our sum is 39 how are we

doing double digit addition is pretty

cool isn't it

now we are going to talk about something

special really special special like seen

an outlet a little baby I'll look at

that yeah so what is this special thing

we are about to learn well

sometimes something sneaky happens let's

show you let's say we are adding 17 plus

15

we of course start with the right side

adding up the ones first so what is 7

plus 5

do you know 7 plus 5 yeah 7 plus 5

equals 12 that's right but there's only

enough room for one digit under the 7

and the 5 so

what do you do well we do a super cool

move called regrouping regrouping

regrouping is awesome remember the some

of our ones column is 12 7 plus 5 equals

12 so we have to regroup the number 12

but what does that mean

what does regrouping even do well

regrouping splits the digits and puts

them in different places now that might

sound weird we're going to show you how

it works it's super simple and fun

regrouping the number 12 is easy all we

do is split the digits putting the two

under the ones and carrying the one with

the tens up here that's it then we add

up the tens what is one plus one plus

one yeah one plus one plus one equals

three so we write three under the tens

and now we have our answer

17 plus 15 equals 32 32 is our sum

remember regrouping is only used when

there is a double digit number but there

is only space for one digit like our

example seven plus five equals twelve

but there wasn't enough room for both

numbers so we keep the two under the

ones and carry the 1 to the tens

hey let's practice by playing a game the

game is called do we need to regroup

this is probably the most exciting

double digit addition game ever hosted

by our very own mr. whiskers thanks for

huh you're not you're not gonna help us

out okay okay now now this is

embarrassing

okay fine okay all right

that's okay all right well we are going

to look at double digit addition

problems and you are gonna let us know

do we need to regroup here is our first

problem 32 plus 19 you already know the

question when we add 32 and 19 do we

need to regroup

[Music]

yes because two plus nine equals eleven

which is a double digit number remember

the first step we take is adding up the

ones but if the sum is a double-digit

number that means we need to regroup

great job let's go ahead and finish the

problem when we regroup we split the

digits so the first one gets carried and

the second number in this case also the

number one stays down under the ones

then we just add up the tents what is

one plus three plus one uh-huh five so

32 plus 19 equals 51 and yes we did have

to regroup here is our second one 56

plus 22 this is the question when we add

56 and 22 do we need to regroup no

because 6 plus 2 equals 8 and 8 is a

single digit number that can fit under

the ones remember the first step we take

is adding up the ones and since the sum

is a single digit number already we do

not need to regroup fantastic let's go

ahead and finish the problem so when we

added up the ones our sum was 8 we'll

put the 8 under the ones then we just

add up the tens

what is 5 plus 2

uh-huh seven and we have our answer

56 plus 22 equals 78 and no we did not

have to regroup here is our next one 34

plus 25 this is the question when we add

34 and 25 do we need to regroup the

answer is no because 4 plus 5 equals 9

and 9 is a single digit number that can

fit under the ones remember the first

step we take is adding up the ones and

since the sum is a single digit number

already we do not need to regroup well

done let's go ahead and finish the

problem just for fun so when we added up

the ones our sum was 9 we'll put the

nine under the ones then we just add up

the tens what is three plus two uh-huh

five and we have our answer 34 plus 25

equals 59 and no we did not have to

regroup

this is our last one you have been doing

great

forty-three plus 37 you already know the

question when we add 43 and 37 do we

need to regroup yes because three plus

seven equals ten which is a double digit

number remember the first step we take

is adding up the ones but if the sum is

a double-digit number that means we need

to regroup wonderful let's go ahead and

finish the problem when we regroup we

split the digits so the number one gets

carried and the second number in this

case the number zero stays down under

the ones then we just add up the tents

what is one plus four plus three uh-huh

eight

so 43 plus 37 equals 80 and yes we did

have to regroup we've had such a great

time in this video we have learned so

much about double digit addition two of

the biggest things we learned is how it

works we add the ones first the right

side and then add the tens the left side

we also learned about something special

called regrouping and how we need to

regroup the sum of a column if it is a

double digit number

it was a blast having you with us if you

have questions want to say hello or want

to let us know how you did comment below

it would be a lot of fun to hear from

you for now we hope you had a great time

and that you will keep learning with us

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