If the estimated value is very different from the calculated value then the answer is wrong. Unfortunately, it does not work the other way. An estimate can be close to the calculated value but the answer can still be wrong.
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How about 3*7*11 = 231 as a product of its prime factors
79 x 1 39.5 x 2
6x2x2
How about: 8*9 = 72
3 times 35 equals 105