You would have to round the factors into a landmark number.
This would make multiplying a lot easier because of the fact, you can do it mentally.
Ex: 9 x 11 = ?
So, 9 is close to 10
11 is close to 10
So, 10 x 10 is 100
Estimation is 100
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The estimate for the product of 289 and 7 is 2,000.
7178 is a single number, there is no product involved.
Ninja
look at the scales
I'd choose 20 and 30 and estimate the product at 600. The actual answer is 625.