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36*.42=
I think it means to do the work and then estimate it. But it could also be estimate the divisor and dividend and then do the work after those two numbers are estimated.
The estimate for the product of 289 and 7 is 2,000.
25x80 < 28x87 < 30x90 --> 2000 < 28x87 < 2700?
7178 is a single number, there is no product involved.