3/15 of 15 is 3
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5/15 = 1/3
It is: 2/15 = 0.1333...recurring 3
1 and 3/15 or 1 and 1/5
13/20 - 3/15 = 9/20
You need to get the denominators (the numbers on the bottom) the same. Eg. 2/3 + 1/5 I'd I can convert both to be the same type of fractions the sum is easy. By making them 15ths (by multiplying the denominators) this will work. I need to convert 2/3 into 15ths - simply multiply top and bottom by 5 2/3 = 10/15 I now need to convert 1/5 into 15ths by multiplying top and bottom by 3 1/5 = 3/15 my sum is now 10/15 + 3/15 = 13/15