Question

estimate 61*47 with rounding off numbers
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Answer 1

Answer:

$61 \times 47 \\ = (60 + 1) \times (50 - 3) \\ = 60(50 - 3) + 1(50 - 3) \\ = 3000 - 1800 + 50 - 30 \\ = 1220 \: ans...$

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