The idea is to round each of the numbers - in this case to the nearest multiple of 10 - then do the addition in your head.
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Round each of the numbers then add the rounded numbers. 60+40=100.
The two numbers with the sum of 15 and the product of 56 are: 7 + 8 = 15 7 x 8 = 56
Their sum is 56.
you put the numbers in order from least to greatest, then u look 4 the middle
the figure is (4x+56)=45.45389