First work out what ONE Fifth of 15 is by dividing 15 by 5
15/5 = 3
So if 3 equals ONE Fifth, then we want THREE of them so multiply by 3
3*3 = 9
THEREFORE
3/5 of 15 = 9
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15/5 = 3 C O'Riordan
10/15 + 3/15 = 13/15 13/15
To find 3/5 of 25, you first multiply 25 by 3 to get 75. Then, you divide 75 by 5 to get the final answer of 15. Therefore, 3/5 of 25 is 15.
If you divide 25 by 5 then you get the the answer 5. Thus 5 is 1 5th of 25. If you multiply 5 by 3 you get the answer 15 15 is therefore 3 5ths of 25.
1/5 + 1/3 = 8/15