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### Course: 5th grade > Unit 7

Lesson 5: Dividing fractions and whole numbers word problems# Fraction division in context

In this video, learn how to divide fractions by whole numbers. Watch examples of real-life situations where this skill is useful. We'll practice dividing a fraction by a whole number to solve problems.

## Want to join the conversation?

- I don't understand can someone help me(12 votes)
- It's easy, individually.(1 vote)

- If I am doing 1/3 divided by 3 would I just multiply the denominator and keep the one?(4 votes)
- Yes that would work, so the answer would be 1/(3*3) = 1/9.

Have a blessed, wonderful day!(5 votes)

- This helped lot and thought me a lot to.(4 votes)
- Is it just me or is this really easy?(3 votes)
- I find this hard, but i also want to share my trail mixes evenly XD XD

Tha'nks Khan Academy LLLLLOOOOVVEEEE it!(2 votes) - So if you have 3 friends and there going on a hike. If they're going to go split the hike which is 1/2 what is their answer?(2 votes)
- at1:05, I ez(1 vote)
- hi there. how our you?(1 vote)
- you spelled are wrong but im doing well(1 vote)

- All you have to do is do 3x1/2. 3x1=3. 3x2=6. 3/6. You can simplify it. The answer is 1/2.(1 vote)
- Sal explains this the hard way. You can just clip the number over for example if it's 1/4 ÷ 3/1 flip the 3 so it's 1/3.(1 vote)

## Video transcript

- [Instructor] We're told that a group of three friends is
practicing for the track meet. The group is going to
run 1/2 of a mile total. If they each run the same distance, how far will each person run? Which expression could
represent this situation? So pause this video and try to
figure this out on your own. All right, the way I think about it is there's some distance that
they're going to try to travel. So in this case, it's half of a mile and they're going to divide that distance amongst the three friends. And so the distance that
each of them are going to run is the total distance divided by the number of folks that are running. So an expression that
represents this is 1/2, the total distance they're running, divided by the number of people who are going to split that
distance, divided by three. And so that is choice C right over here. Now it might have confused you a little because you're not used to
dividing a smaller number, especially a fraction, by a lager number but that's exactly what's
going on over here. You're taking the total distance and it's being split
amongst three friends. So the total distance
divided by three friends will tell you how far
each of them has to run. Let's do another example. So here, we are, actually
they're telling us that there's some problem
that can be solved with 1/2 divided by seven. They say which problem can we solve with 1/2 divided by seven? And then they give us
three different scenarios that we could try to solve. So pause this video and think of which of these three scenarios can be solved with this expression. All right, let's go through
each of the choices. Cara ordered seven pizzas
for her birthday party. Her parents ate 1/2 of a
pizza before the party. How much pizza is left for the party? All right, so what's going on here? She started with seven
pizzas, she starts with seven. Her parents ate 1/2 of a pizza. So 1/2 of a pizza is taken away. And so that would tell
you how much is left. So this is definitely,
this is the expression you would solve to figure out A, not this expression up here. So I would rule this out. Walt has seven hamsters. Each hamster weighs 1/2 of a kilogram. What is the total weight of the hamsters? Well to figure out the total weight, you would start with
the number of hamsters and you would multiply that times the weight of each hamster. So that would be seven times 1/2, so we could rule that one out. So it's likely going to be C but let's figure this, let's
make sure it makes sense. Jenae has 1/2 kilogram of trail mix. She splits her trail mix
evenly between seven friends. How much trail mix will each friend get? All right, she has a total
amount, 1/2 of a kilogram and she's going to
divide that total amount, she splits her trail mix
evenly between seven friends so she's going to take this
1/2 and split it evenly amongst seven friends to get
a certain amount per friend. How much trail mix will each friend get? And that's exactly what
that expression up there is so I am liking this choice.