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Question
Which is an example of the compensation strategy?
a) 63x 5 = 63 + 63 + 63 + 63 + 63 = 315
b) 27 x4 = 20x4 + 7x 4 = 80 + 28 = 108
c) 27x 4 is about 30 (27 + 3)x 4 = 120; then subtract out the extra 3 x 4, so 120 -12 = 108
d) 46x 3 = 46x 2 (double) + 46 = 92 + 46 = 138
Answer
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