Question

what should be added to 7/8 to get -1

Answer 1

Let the number be added to 7/8 to get -1 be x
Now,
7/8 + x = -1
x = (-1) + (-7/8)
x = -1 -7/8
x = (-1(8) -7)/8
x = (-8 -7)/8
x = -15/8

Thus,-15/8 should be added to 7/8 to get -1