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Add 80/21 and 70/20

1st number: 3 17/21, 2nd number: 3 10/20

80/21 + 70/20 is 307/42.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    80/21 = 80 × 20/21 × 20 = 1600/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    70/20 = 70 × 21/20 × 21 = 1470/420
  4. Add the two like fractions:
    1600/420 + 1470/420 = 1600 + 1470/420 = 3070/420
  5. 3070/420 simplified gives 307/42
  6. So, 80/21 + 70/20 = 307/42
    In mixed form: 713/42

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