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OpenStudy (anonymous):
multiply the following expression mentally 12 x 22= 12(20+2)=
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OpenStudy (whpalmer4):
mentally write down your answer :-) 12*20 = 12*2 = those two added =
OpenStudy (whpalmer4):
you could also do this as 22(10+2) = 22*10 = (easy) 22*2 = (also easy) those two added = (same answer as the other way)
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