You know if an answer is an over or underestimate because if the last 2 # is 5 and over, it is an overestimate. If the last 2 # is 4 and under, it is an underestimate. Ex: 345 answer if you were estimating 350 over. Ex: 232 if you were estimating your answer would be 230 and that is under.
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Explain how you know whether an estimate of a product is an overestimate or an underestimate?
If you rounded up, it's an overestimate, if you rounded down, it's an underestimate. If you did both, whatever you did more of will prevail.
You know when to overestimate when the last number is over five then you round it up. Under is the last number below five you round down.
If you had an Overestimate,then whatever you got is equal to or if you round it and you get it.Lets say you did a problem with rounding and multiplication.The question asked is there a reasonable answer for it.The answer you got was 2,500 and the question got 2,750.2,500 is close to 2,750 so that's an Overestimate.If the question got 3,500 then you call that an Underestimate.
when both factors in a multiplication problem are rounded up to estimate the product, the estimate is an overestimate.