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Anonymous
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(6x3) + (7x3) = 18 + 21 = 39
4 x 18 = (4 x 10) + (4 x 8)
18
18 x 27 = (18 x 20) + (18 x 7)
I don't. I learned the 18 times table at school - around 50 years ago - and still recall it.