0
Anonymous
anything
Wiki User
-27
10 and -9
-1
If the digit sum of a number adds up to 9 then it is divisible by 9.
-91
-10 and 1
9 and 11.
-3 and -3.
5 & 9. 5 + 9 = 14... 5 x 9 = 45.
-19
569
191