Question

why is 9 -1is 8 can some one help me because i dont understand why is not 10

Answer 1

Its 8 because your not adding your subtracting.

Answer 2

Ah, the dash, this thing, - means subtraction, which is the opposite of addition, and takes away numbers. Meaning 9-1 is 9, but you count down by 1 rather than up one.