Division word problems within 100: How many groups?

- [Instructor] We are told a
party store has 52 balloons.

The store owner wants to
tie four balloons together

in each group to decorate
the front windows.

How many groups can the store owner make?

Pause this video and have a go at this

before we do this together.

All right, now let's do this together.

So if we had a certain number of groups,

so let me write this, number of groups,

and if we had that number of groups,

times four, times four,

that would be the total
number of balloons we have,

which we know is going to be 52 balloons.

So another way to think about it is

we have blank times four is equal to 52,

or we could say four times
the number of groups blank

is equal to 52,

or we could say that blank

is equal to 52 divided by four.

So what do we get for that blank,

which is also going to be the same thing

as the number of groups?

The number of groups.

Well, actually let's go back
to this one right over here,

four times what is equal to 52?

Well, we know that four times 10

is going to get us to 40.

So how do we get to 52? Well,
we have to get another 12.

So another way to think
about it is four times what

is going to be equal to 40 plus 12.

Well, we know that if
you take four times 10,

we know that if you take
four times 10, you get to 40.

And then we also know if
you take four times three,

you get to 12.

So if you take four times
four, let me write it this way,

four times 10 plus three,

that's going to be, we just
use the distributive property,

that would be four times 10, which is 40,

plus four times three plus 12,

that is going to be equal to 52,

which is exactly what we wanna get to.

So 10 plus three, this is 13.

So four times 13 is equal to 52.

So blank or the number of groups is 13.

Number of groups, 13, times
four is truly equal to 52

or 52 divided by four is 13.