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Add 70/21 and 40/12

1st number: 3 7/21, 2nd number: 3 4/12

70/21 + 40/12 is 20/3.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    70/21 = 70 × 4/21 × 4 = 280/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    40/12 = 40 × 7/12 × 7 = 280/84
  4. Add the two like fractions:
    280/84 + 280/84 = 280 + 280/84 = 560/84
  5. 560/84 simplified gives 20/3
  6. So, 70/21 + 40/12 = 20/3
    In mixed form: 62/3

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