There is no need for estimation here.
You can get the exact answer.
649 - 52 = 597
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Estimate: 80 times 50 = 4000 Actual: 77 times 52 = 4004
52
52% of 38 = 0.52 * 38 = 19.76 which when estimated to the nearest whole number = 20.
(21 + 45) / (63 - 52) = 66 / 11 = 6
41 * 50 = 2,050