Name: Subtracting mixed numbers with regrouping
Uploaded: 2020-03-27T17:40:00.000Z
Duration: 3 min
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Modal verbs - A2

- [Instructor] So let's see how we could approach

The imperative

All right, so the first thing that you might try to do

is re-write this as four and 1/4 minus two and 2/4.

And the reason why it's useful to write it this way

is we could say look, each of these mixed number

And so I could try to subtract the fractional part

and then the whole number part from the whole number part.

But when we go to just the fractional parts

and we say hey, how do I subtract 2/4 from 1/4,

Well, what comes to the rescue is a notion called regrouping

and that's that we're not just subtracting 2/4 from 1/4.

We're subtracting two and 2/4 from four and 1/4.

So what we could do is we could take some of the value

that's in this four and regroup it into the fraction.

So I could re-write this as three and 5/4

is this is the same thing as four minus two

And we have trouble with the 1/4 minus 2/4.

So what we do is we take some of that value from the four.

Instead of four we could re-write that as three plus 4/4.

And of course you have minus two plus 1/4 minus 2/4.

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Subtracting mixed numbers with regrouping

approach

immediately

notion

fraction