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  • - [Instructor] We are asked what fraction is located

  • at point A on the number line?

  • And we can see point A right there.

  • Pause this video and see if could answer that.

  • All right, now there's a bunch of ways

  • that you could think about it.

  • You could see that the space between zero and one

  • is split into one, two, three, four equal spaces.

  • And this has gone three of those four equal spaces

  • from zero to one.

  • So that's one interesting way to think about it.

  • Another thing that might help us

  • is a bit of a visualization.

  • If this rectangle represents a whole

  • and notice it goes from zero to one,

  • so you could view one as a whole,

  • we have split it into four equal sections.

  • So each of these equal sections you would consider a fourth.

  • So that's a fourth right over there.

  • That's another fourth right over there.

  • This is another fourth right over there.

  • So how many of these fourths have been shaded in?

  • Well three of them have been shaded in.

  • And when you look at the number line,

  • you see the same idea.

  • When we see the space between zero and one

  • it has been split into fourths.

  • So this is a fourth, and then another fourth,

  • and then another fourth, and another fourth.

  • And where is point A?

  • Well we have gone 1/4, 2/4, 3/4 past zero

  • or from zero to one, which is a whole.

  • So what fraction is located at point A on the number line?

  • 3/4.

  • Let's do another example.

  • So here we're told which point is at 2/6 on the number line.

  • Pause this video and see if you can answer on your own

  • before we work through it together.

  • And I'll give you a little bit of a hint.

  • Let's imagine that this rectangle represents a whole

  • and notice it is divided into six equal sections

  • so each of those sections is 1/6.

  • And so if I start at zero, how many would I fill in

  • to get 2/6?

  • And what would be the corresponding point

  • on the number line?

  • All right, now let's do it together.

  • So if each of these is a sixth,

  • and we have 6/6 there so that would be a whole

  • and that's good because it goes from zero to one

  • and you can view one as a whole.

  • 2/6 is, so that's 1/6 right over there

  • and then that is 2/6.

  • And so you can see on the number line,

  • the thing that gets us 2/6 of the way to one is at point B.

  • It corresponds to how much we've filled up that rectangle,

  • point B right over there.

  • Now another way that you could think about it,

  • you could see that the space between zero and one

  • is split up into six equal sections.

  • One, two, three, four, five, six equal sections.

  • And we want to go to 2/6.

  • 2/6.

  • So each of those equal sections,

  • we are increasing by a sixth.

  • So we're going from zero to 1/6 to 2/6.

  • Once again we end up at point B.

- [Instructor] We are asked what fraction is located

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A2 初級

將數字線與分數條聯繫起來 (Relating number lines to fraction bars)

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    林宜悉 發佈於 2021 年 01 月 14 日
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