10. With only one fraction the question is a no-brainer!
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what is 1 over 10 and 2 over 15 with the same denominator
20 is the lowest common denominator for 4 and 10.
10.
To subtract fractions, you need to find a common denominator. The common denominator for 10 and 4 is 20. So, rewriting the fractions with a denominator of 20, we get 6/20 - 5/20 which equals 1/20.
A common denominator of 6 and 15 is 90.