1/7+1/3
first get common denominators
3/21+7/21
add the numerators
10/21
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1/5 plus 1/7 plus 3/10 is equal to 0.642857
((2 plus (1 over 4)) plus 3) plus (7 over 8) = 6.12500
6/7
3 plus 3 plus 3 over 3So 3 + 3 =6. 3 over 3 is 1. 6 + 1 = 7
4/7