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• - [Instructor] I'm here at the Khan Academy exercise

• called Find One on the Number Line

• and they're asking us to do exactly that.

• It says, "Move the dot to one on the number line,"

• and it's a little interactive dot

• that I can move around.

• And so, let's think about how I would do it

• and I always encourage you,

• pause this video and see at least how

• you would think about doing it

• or put your finger on the screen where you think one is

• and then we'll work through it together.

• All right.

• So they've told us where zero is

• and they've told us where seven fourths is.

• So one thing I could do is

• I could say well how many of these equal spaces

• does it take me to get from zero to seven fourths.

• So let's see it's one, two, three, four, five, six, seven.

• So if it takes seven equal spaces to get to seven fourths,

• that means that each of these spaces is one fourth

• because then it would be one fourth, two fourths,

• three fourths, four fourths, five fourths, six fourths,

• and seven fourths.

• All right, we're making some good progress.

• So where would one be?

• Well, one would be four fourths.

• So we would go one fourth, two fourths, three fourths,

• and then four fourths.

• So that's where one is.

• So the important thing to realize is the only way

• we knew that each of these, each of these gaps,

• or each of these spaces from one hash to the next,

• the way that we knew that each of those is a fourth

• is by saying hey look, seven of those equal spaces

• get us to seven fourths,

• so each of these must be a fourth.

• So four of those, four fourths, would be equal to one.

• Let's do another example.

• So here, we're said, we're told to move the dot

• to one on the number line.

• So put your finger on where that would be on the screen.

• Pause the video and do that.

• All right.

• In some ways this is a little bit easier

• because they told us that going from zero

• to the next little cross or hash, I guess you could say,

• whatever you want to call these things, is one sixth.

• So what is one?

• Well, one or one whole is six sixths.

• So this is one sixth, two sixths, three sixths,

• four sixths, five sixths, and then six sixths.

• So there we go.

• That is where is one is on this number line.

- [Instructor] I'm here at the Khan Academy exercise

A1 初級

# 在數字線上找1 (Finding 1 on the number line)

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林宜悉 發佈於 2021 年 01 月 14 日