18! This is the simplest of arithmetic!
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8.9 x 10^18 x 78 = 694.2 x 10^18 = 694200000000000000000
-10
10% off $18 = $18 - ( 0.1 x $18) = $16.2
28-18=10 or 18-28= -10
Prime factorization:10 = 2 x 518 = 2 x 3245 = 5 x 322 x 5 x 32 = 90 (the LCM of 10, 18, and 45)