How to explain 2 Digit Addition
Double-Digit Addition for Kids
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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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