25x80 < 28x87 < 30x90 --> 2000 < 28x87 < 2700?
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36*.42=
Ninja
When adding or subtracting fractions with different denominators finding the prime product of each denominator helps in finding the lowest common denominator of the given fractions by their lowest common multiple.
1,400
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.