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lowest common denominator= 70 therefore; 5/7 + 7/10 = 50/70 + 49/ 70 = 99/70= 1 and 29/70 5/7 - 7/10 = 50/70 - 49/70 = 1/70

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Q: What is the lowest common denominator of the fractions 5 over 7 and 7 over 10?
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