Question

How do you write the subtraction problem `7/8-9/10` as an addition problem?

Answer 1

`=(-1)/40`

Explanation:

To subtract is the same as adding on an inverse.

`8 - 5 = 8+(-5)`

`7/8 -9/10`

`= 7/8 +(-9/10)`

`=(35+(-36))/40`

`=(-1)/40`