To estimate 37x22, we can round each number to the nearest tens place, which would be 40 and 20. Then, we can multiply these rounded numbers together to get an estimate. 40 multiplied by 20 is 800. Therefore, the estimate of 37x22 is 800.
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900 would be a fair estimate
You could estimate is as 0.5
The closest estimate is the exact answer. For any other estimate, you can always get closer.
over-estimate
The answer depends on what you wish to do with the number.For 53.54/9 I would estimate it as 54. For 53.54*62 I would estimate it as 55.