0
Anonymous
Eleven.
20
11
11 with 1 remaining 100 - 1 = 99 = 9 x 11
99 plus 9/9 = 100
(9*9)+(9+9)+(9/9) = 100
5
Nine of them
79
One way: 99 + 9/9 = 100
9^2+9+9 +9/9 81+9+9+1=100
24 of them with a remainder of 2