12 centimetres is a reasonable estimate.
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4 or 5 inches
Estimate the answer. If the calculated answer is close to the estimate then it is reasonable.
24 is a reasonable estimate. (78% of 31 is 24.18).
10 metres is not just a more reasonable estimate, it is the only estimate that anyone but an ignoramus would make.10 metres is not just a more reasonable estimate, it is the only estimate that anyone but an ignoramus would make.10 metres is not just a more reasonable estimate, it is the only estimate that anyone but an ignoramus would make.10 metres is not just a more reasonable estimate, it is the only estimate that anyone but an ignoramus would make.
A reasonable estimate for 83*69 is 80*70 = 5600.The true figure, for comparison, is 5727.