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• - [Instructor] Let's say that we want to figure out

• what is seven and 11/12 minus one and 6/12.

• Pause this video and see if you can figure that out.

• All right now let's work on this together.

• So there's a couple of ways that you could approach this.

• You can view this as the same thing as seven plus 11/12

• and then minus one and you might be tempted to say minus

• one and then plus 6/12 but remember you're subtracting

• not just the one you're subtracting one and you're

• subtracting 6/12 so minus one minus 6/12.

• Now why is that useful to think about it that way?

• Well now you can think about the whole numbers so you can

• say this is going to be seven minus one plus 11/12,

• plus 11/12 minus 6/12, minus 6/12.

• And so seven minus one is six, so it's going to be six plus

• now if I have 11 of something in this case 12ths

• and I'm subtracting six of them away six of the 12ths,

• I'm gonna be left with five of those somethings, five 12ths.

• So it's going to be six plus 5/12 which is the same thing

• as six and 5/12.

• Now as you get more used to this you could do some

• of this maybe even in your head, you could say hey look,

• look at the whole number parts, seven minus one is going

• to give me six and then if I say 11/12 minus 6/12

• is going to give me 5/12 so that takes up a little bit

• less space.

• Another way that you might see this approached is you can

• rewrite this as seven and 11/12 minus, minus one and 6/12.

• Let me do the 6/12 in that blue color that I'm using

• for the fraction parts, 6/12 and then I would first

• focus on the fractional parts and I'd say 11/12 minus 6/12

• is 5/12 and seven minus one is six and I got six and 5/12.

• So many different ways to approach the same thing

• and at the end of the day they really are the same

• underlying idea.

- [Instructor] Let's say that we want to figure out

A2 初級

# 混合数の引き算 (Mixed number subtraction)

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林宜悉 に公開 2021 年 01 月 14 日