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estimate wheather each sum or dsifference is reasonable. if it is not reasonable, estimate the sum or difference 1/5 + 5/8 is about 3/4

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Hello!

It is reasonable. if we sum 1/5+5/8 by GCF we get 8/40+25/40=32/40 which 30/40=3/4 so it is a reasonable estimate

hope this helps. any questions please just ask. thank you!
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