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Add 70/20 and 81/7

1st number: 3 10/20, 2nd number: 11 4/7

70/20 + 81/7 is 211/14.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 7 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 20 × 7 = 140,
    70/20 = 70 × 7/20 × 7 = 490/140
  3. Likewise, for the 2nd fraction, since 7 × 20 = 140,
    81/7 = 81 × 20/7 × 20 = 1620/140
  4. Add the two like fractions:
    490/140 + 1620/140 = 490 + 1620/140 = 2110/140
  5. 2110/140 simplified gives 211/14
  6. So, 70/20 + 81/7 = 211/14
    In mixed form: 151/14

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