If two fractions share an equal denominator, you can simply add the top, so 15 + 4 = 19, so therefore = 19/25
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-4/25 + 19/25 = 15/25 = 3/5
It is: 0.64+4/25 = 4/5 or 0.8
2/5 + 4/25 = 2x5/5x5 + 4/25 = 10/25 + 4/25 = (10 + 4)/25 = 14/25
4/25 + 2/15 = 12/75 + 10/75 = 22/75
4/5 + 1/1512/15 + 1/15=13/15