First find the common denominator, which is 70. Then convert both fractions to the common denominator. Then add the numerators. Last, convert to simplist terms. 7/10-2/7=49/70-20/70=29/70 29/70 is already in simplist terms, so the answer is: 29/70.
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seven tenths
Seven-and-one-sevenths!
20/21
5/70 or0.0857142857
Each time, you add one to the numerator and one to the denominator.