31 - 13 = 18
It is: 1/10
31-(-6) We know minus and minus becomes plus 31+6 37
31 minus 9 is 22 31 - 9 = 22
-31
-13 minus -13 is 0.
-3
31
104 minus 13 is 91.
-8 - (-13) = - 8 + 13 = +5 ( minus a minus is a plus)
31 - 17 = 14
31 - 19 = 12
2012 - 31 = 1981