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537 round to 530

78 round to 80

53*2 = 106

106*2 = 212

121*2 = 424

and the two 0s - one each from 530 and 80 - make it 42400.

[The exact answer is 41886]

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11y ago
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Q: How do you round 537 and 78 to estimate the product 537 and 78?
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