It depends on how competent at arithmetic you are.
The basic level is
38*54 = (30 + 8) * (50 + 4) = 30*50 + 30*4 + 8*50 + 8*4
= 1500 + 120 + 400 + 32 = 2052.
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38 x 54 = 2052
19 For partial-products you break the numbers up into different problems * 6 like 9 times 6, and 6 times 10, then you just add the two sums together ------------- to get the whole sum 9*6= 54 6*10= 60 60+54= 114
54
(35+54+7+64+54+38)/6 = 42
54 x 54 x 54 = 147,464