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18 * 27 = (10 + 8)*(20 + 7) = 10*20 + 10*7 + 8*20 + 8*7
= 200 + 70 + 160 + 56
= 486.
In fact, though, the following may be easier (even if it looks longer):
18 * 27 = (9*2) * (9*3) = (9*9) * (2*3) = 81*6 = (80 + 1) * 6
= 80*6 + 1*6 = 480 + 6 = 486
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