You can see clearly that the actual answer will be 3927, but if you have to, estimate 1300 x 3 = 3900
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As a product of its prime factors: 7*11*17 = 1309
To the nearest integer, 3
The estimate is 3 divided by 3 equals 1, but the actual answer will be less than that. Estimate 0.8
20.8
The closest estimate is the exact answer. For any other estimate, you can do better with more effort.150*83 = approx 100*3/2*82 = 100*3*41 = 100*3*40 = 12000.