# How to do 12 3/8 - 7 1/2?

I have figured out how to add these type of fractions but how do you subtract?!

On subtracting this, do you still cross mulitply? PLEASE EXPLAIN!!!

A. 4 7/8

B. 5 7/8

C. 5 1/3

D. None of the above

Relevance

12 3/8 - 7 1/2

There are multiple ways you could do this, but here is one way.

8x12+3 = 99/8 (99/8 is the exact same thing as 12 and 3/8 but I am just putting it all on one fraction)

2x7+1 = 15/2 ( same as 7 and 1/2 as well)

99/8 - 15/2

Next I would put the fractions on the same denominator, and so I am going to put them both on 8 as that seems the easiest.

15x4/2x4

= 60/8

99/8 - 60/8

And so now you would not minus the denominators, but only the numerators. And so you would do 99-60/8 = 39/8

I see that the choices you have are all mixed fractions (meaning whole numbers and fractions together, unlike 39/8) and so I am going to put it back into a mixed fraction. 8 goes into 39 4 times, and there is 7 leftover. And so, the answer would be 4 7/8 (The letter A)