How do you subtract a bigger numerator from a smaller numerator?

Answer 1

Subtract the other way, then add a minus sign. For example, to subtract 6 - 8, you subtract 8 - 6, get the answer 2, then add a minus sign to get -2.

Don't forget to subtract numerators you need a common denominator first. For example

1/4 - 3/8 = 2/8 - 38 = -1/8