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• - [Instructor] So in this video,

• we're going to think about dividing numbers

• where the quotient, the result of our division,

• might result in a decimal.

• So let's say we wanted to compute

• what five divided by two is.

• In the past, you might've said,

• hey, two times two is four

• and then you'd have one leftover

• and so you might have said something like this,

• this is two with a remainder of one.

• But now we don't want, we don't wanna just say,

• hey, how many times can it go in and what's left over.

• We wanna know exactly how many times can two go into five

• so we want a decimal answer right over here.

• So, pause this video and see if you can figure that out.

• All right, now let's work through this together.

• And there's many ways that we could approach this.

• One way is to realize that five divided by two,

• we could re-express as five divided by two

• or as five halves and five halves is the same thing

• as four plus one over two

• which is the same thing as four halves plus one half

• which is the same thing as four halves is two.

• Let me do that in a different color.

• This part over here is two

• and then you have this one half.

• So it's the same thing as two and a half

• and if we were to express that as a decimal

• that's going to be equal to two

• and how many tenths is equal to a half?

• Well five tenths is equal to a half.

• So five divided by two, you could say, 2.5.

• Now another way that you could approach this is you say,

• five divided by two is the same thing as

• 50 tenths divided by two.

• So let me use a different color here.

• So instead of a five, I could say five

• is the same thing as 50 tenths,

• 50 tenths divided by,

• divided by two

• and so if I have 50 of something

• and if I were to divide it by two,

• well that's going to result in 25 of the something.

• So this is going to be equal to 25 tenths.

• And how would we express 25 tenths as a decimal?

• Well, this is going to be equal to,

• if I could put some place values here,

• so we definitely have five tenths.

• I'll put that in the tenths place

• and then 20 tenths is the same thing as two ones.

• And that's exactly what we had up here.

• Either way, you get 2.5,

• two ones and five tenths.

- [Instructor] So in this video,

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A2 初級

# 小数点以下の除算 (Division resulting in decimals)

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林宜悉 に公開 2021 年 01 月 14 日