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asked Mar 10 in Other Math Topics by anonymous

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LCD of 8 and 5 is 40. 1/8=5/40 and 2/5=16/40 so their sum is (5+16)/40=21/40.

A rough estimate is obtained by observing that 1/8 is close to 1/10 and 2/5 is exactly 4/10. So the sum is 5/10=1/2. This is quite close to the exact result 21/40 because 21 is about half of 40.

 

answered Mar 11 by Rod Top Rated User (571,200 points)

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