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(18 x 9) - (19 x 8) = 10
18
-19 - 8 = -27
19
-18
Exactly 19 times !... Without the aid of a calculator !
11 x 8 = 88 11 + 8 = 19, not 18
37/8 - 18/8 = 19/8 = 2 and 3/8
80/19= 4, 21
-8 -10 = -18
-5 - 13 = -18
(-8) x (-7) - 14 = 42