4 1/7 (four and one seventh).
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Ten sevenths or one and three sevenths
Three sevenths plus six sevenths equals nine sevenths. To add fractions with the same denominator, you simply add the numerators together and keep the denominator the same. In this case, 3 + 6 = 9, so the sum is 9/7.
4/5+2/7=38/35 which is equal to 1 and 3/35
0.4
The sum of 1/3 and 2/7 is 13/21