99 x 10 - 99 x 9
= 99(1 x 10 - 1 x 9)
= 99(10 - 9)
= 99(1)
=99
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9 x 9 = 81 81 + 9 = 90 90 + 9/.9 = 90 + 10 = 100 i.e. (9 x 9) + 9 + 9/.9 = 100 ---- 99 + sin(99 - 9)o = 100
Expanded Notation of 99 = (9 x 101) + (9 x 100)
11 x 9
There are infinitely many solutions to 11x - 99 = 11(x - 9)
9 x 111 = 999 To simplify the sum, think of it as making 99. 9 x 11 = 99 Then multiply the answer (99) and 11 by ten. That is your answer