You cannot have a product of only one number!
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.
0.4divided by 25 work being shown = 0.016
4 divided 457 work shown = 0.0087527352297593
0.0112
Rounding 52.2 down to 50 and 39.7 up to 40 gives an estimated product a little greater than 2,000. For a more accurate estimate, round the 52.2 down to 52, giving an estimated product of 2,080. The object of estimating in multiplication is to make the multiplicand and multiplier simple enough to work out their product in your head.
It is helpful because when you are finished estimating (for example: multpliying, diving, adding or subtracting) it's like checking your work that's why it can be helpful to estimate before finding the actual product.
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8.7
0.0773
7.5
A rough estimate
0.05, in decimal, is 0.05. Is that enough work shown?