9 - 9 = 0
0
Sobtract 1 from minus 9 and get minus 10.
It is -6 minus -9 = +3. That's because minus -9 is the same as +9.
-5 minus 4 is -9.
0 minus -9 is 9
31 minus 9 is 22 31 - 9 = 22
-18 minus 9 is -27
minus 21 think of it as 12+9 which equals 21 then just whack a minus sign infront
7/9 minus 2/9 is 5/9
It is: 8/9 minus 4/9 = 4/9
-7. Minus seven.
27