1/2-7/8

To subtract the fraction 7/8 from 1/2, you must first make sure that the two fractions have a common denominator. In this case, the number 8 is a common multiple of both 2 and 8, so we can use 8 as the common denominator.

Now, convert 1/2 into a fraction with an 8 as the denominator: 1/2 = 4/8 (since 1 * 4 = 4 and 2 * 4 = 8)

Now you can subtract the two fractions: 4/8 - 7/8 = (4 - 7)/8 = -3/8

So, 1/2 - 7/8 equals -3/8.