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First you have to make the same denominators: Find the lowest number that 7 and 3 both go into which is 21. So multiply the denominator by the number that makes 21 on both 2/7 and 1/3. Make sure to multiply the number you used on den. on the numerator to. Here are the new fractions: 6/21 and 7/21 Then subtract as normal. Answer would be negative 1/21 or -1/21
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