5/21 + 1/7 = 56/147 or 8/21
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2 over 5 converts into 16 over 40 1 over 8 converts into 5 over 40 =21 over 40
25/45 + 21/45 = 46/45 or 1 and 1/45
2/5 plus 1/3 plus 5/6 is equal to 1.57 or 1 57/100
13/21 - 7/21 = 6/21 Sorry, DJ, 4 over 7 = 12/21 so answer is 5/21
1/5 plus 1/7 plus 3/10 is equal to 0.642857