Answer :

To be able to compare 2 fraciton we have to make common denominator and then we can just compare numerators. 
[tex] \frac{4}{5}= \frac{4*2}{5*2}= \frac{8}{10} [/tex]
Now we can compare numerator from the first (9) and from the second fraction (8)
9>8, so the bigger is 9/10
9/10 because smaller pieces and has more of them

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