4/5.
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Steps: Find a common denominator - 20. 4 x 5 = 20 3 x 5 = 15 --- 15/20
5 x 4 = 15 -- 4 x 4 =12 ---- 16/20
16/20 is bigger than 15/20.
So, 4/5 is bigger.
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Glad I could help, and good luck!
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