a) =1001 / 11 = 91 = 7 * 13
b) = 196 + 25 + 4 = 225 = 15 * 15 = 3*3*5*5
c) = 899 + 144 / 144 = 899 + 1 = 900 = 2 * 2 * 5 * 5 * 3 * 3
d) = 111 + 1 = 112 = 2*2*2*2*7
a/ (1000 + 1) : 11 = 91 = 7 . 13
b/ 142 + 52 + 22 = 225 = 52 . 32
c/ 29 . 31 + 144 : 122 = 900 = 22 . 32 . 52
d/ 333 : 3 + 225 : 152 = 112 = 24 . 7