6/7 + 1/3 You need to find the common denominator
18/21 + 7/21= 25/21= 1 and 4/21
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13/12
13 over 12
1/6 + 2/3 + 1/4 = 2/12 + 8/12 + 3/12 = 13/12 = 1 1/12
1/6+2/3+1/4 = 2/12+8/12+3/12 = 13/12 = 1+1/12. One and one twelfth
2/3 + 4/6 = 4/3 or 11/3