18/42 simplifies to 3/7, the greatest common number you can divide by is 6 so 18/6 is 3 and 42/6 is 7, so 3/7
15/40 simplifies to 3/8. The greatest number you can divide by is 5. So 15/5 is 3 and 40/5 is 8, making 3/8.
18/42 = 3/7
15/40 = 3/8
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