6300
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Estimate the answer. If the calculated answer is close to the estimate then it is reasonable.
because if you were finding the estimate of 6-3 it wouldn't be 54853 it would be a smaller number
12 centimetres is a reasonable estimate.
You can check by using your estimated number and comparing it with your exact quotient.
24 is a reasonable estimate. (78% of 31 is 24.18).