minus 21 think of it as 12+9 which equals 21 then just whack a minus sign infront
3 minus -9 is 12.
It is -6 minus -9 = +3. That's because minus -9 is the same as +9.
9 - -3 = 9 + 3 = 12 12 - 8 = 4 9 - -3 - 8 = 4
0
9/10 minus 3 is -2 1/10
2 - (-9) - 8 = 3
-9
6
9-3=6
9 + 3 = 12
(-9) / 3 = -3 . Minus nine divided by three is equal to minus three