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  • - [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.

- [Instructor] We're told that a group

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A2 初級

分數除法的背景 (Fraction division in context)

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    林宜悉 發佈於 2021 年 01 月 14 日
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