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Because 3 is greater than 1. I suppose it's possible to do it in your head, if you remember that in the world of fourths, 1 - 3 equals 2 but it's easier to subtract 3/4 from 17/4 or 3 and 5/4. As long as you can get to 3 and 1/2, it doesn't really matter, but don't tell your teacher I said that.

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Q: Why is it necessary to rename 4 and 1 over 4 if you subtract 3 over 4 from it?

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Because you cannot subtract 3/4 from 1/4.

Probably not, but it depends on what you mean by "3th".

1 1/2

1/3

It is not necessary. Sometimes, though, it is easier to find the probability of the complement and subtract that probability from 1.

It means find the LCM of the denominators. In order to add and subtract fractions with unlike denominators, it is necessary to convert them to equivalent fractions with a common denominator. Example: 1/4 + 1/6 The LCM of 4 and 6 is 12. 1/4 = 3/12 1/6 = 2/12

The answer is 143.75

-1/9

It is: 7/12

18

1/6

1 over 8

Yes. Anything minus itself is zero.

If you can do it without, go ahead. But it helps to get the correct answer, since three is larger than one. If you re-name 4 and 1/4 to 3 and 5/4, it's easier to subtract 3/4 from it.

1 whole and 7 over 12

0.71875 is the answer. -SummerGal1998

1 and 2/189

5/12 - 4/12 = 1/12

23 and 2/3

Here's how to Rename folders: 1. Right-click the folder you want to rename. 2. Select Rename. 3 Change the name to what ever you want

4/7 minus 1/6 = 17/42

Subtract them. example: x3 --- x1 Subtract the 1 from the 3 and you get x2 over 1 or just x2

6/9 - 1/3 = 2/3 - 1/3 = 1/3

1

5/9-1/3 is the same as 5/9-3/9. This would then subtract out to be 2/9. (2 over 9)