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## 4th grade

### Course: 4th grade > Unit 5

Lesson 7: Multiplication, division word problems# Multiplication word problem: pizza

Sal solves a multiplication word problem. Created by Sal Khan.

## Want to join the conversation?

- I can not understand the question,and i do not know how to answer the question(4 votes)
- so basically, there is 7 pizzas, and those pizzas are cut into 12 pieces
**each**so now you multiply**7 x 12**which gives you**84**. So now you know that in*total*there are**84**slices of pizza. Now for the people, there are**16**people who are coming to the party, and each person is going to eat**4**pieces of pizza. To find out how many pieces of pizza are going to be eaten at the party, we will multiply**16 x 4**because there is**16**people and**4**pieces per person, so this equation gives us**64**now we know that in total**64**pieces of pizza will be eaten at the party. and finally we take our**84**pieces of pizza and subtract/eat**64**of those pieces and what is left of that is the answer. the answer is**20**

I really hope that helped!(24 votes)

- yay pizza. what flavour is it?(9 votes)
- i like pizza but free me from school if you tell me im not getting any smarter.(3 votes)
- free us from school i hate it(6 votes)

- Free me from school. Lets leave khan academy behind(4 votes)
- What? Khan academy is great!(3 votes)

- I was doing this last year in third grade y'all!(6 votes)
- It really took him 2 minutes to finish this one problem…..(4 votes)
- I just got the exact same question doing Practice: Multi-step word problems and division problems with whole number(4 votes)
- So I also got it(0 votes)

- pi=3.14159. i memorized(3 votes)

## Video transcript

Beatrice is ordering
pizzas for a party. Each pizza is cut
into 12 pieces. Beatrice wants to
have enough pizza so that each person
can have 4 pieces. And 16 people will
be at the party. A lot of information
in this problem. If Beatrice buys 7 pizzas, how
many extra pieces will there be after each person
eats 4 pieces? So to do this, let's think
about how many total pieces she will have. And then let's think about
how many total pieces will be eaten by the 16 people. And then we'll figure how
much that she had extra. So first, let's think about
how many total pieces. And I encourage you to pause the
video and try to figure it out yourself. She ordered 7 pizzas. How many total pieces
are there going to be? Well, you have 7 pizzas. 7-- that's the number of pizzas. And if you have 12
pieces per pizza, you multiply by 12 to get
the total number of pieces. So this is number
of pieces per pizza. And 7 times 12 is equal
to 84 total pieces. So that's how many
pieces she's got. Now let's think about how many
get eaten by the 16 people. So you have 16 people. 16-- that's the
number of people. And this little symbol,
that's shorthand for number. 16 people, and they
each eat 4 pieces. So 16 people times
4 pieces per person. So number of pieces per person. 16 times 4 is 64. So that's 64--
not 84-- 64 pieces are eaten by the 16 people. So how much does
she have left over? Well, if you start with 84
pieces and 64 get eaten, 84 minus 64 is 20. We deserve a drum roll now. You have 20 extra pieces after
everyone eats their share.