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Add 72/20 and 14/21

1st number: 3 12/20, 2nd number: 14/21

72/20 + 14/21 is 64/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420
  2. For the 1st fraction, since 20 × 21 = 420,
    72/20 = 72 × 21/20 × 21 = 1512/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    14/21 = 14 × 20/21 × 20 = 280/420
  4. Add the two fractions:
    1512/420 + 280/420 = 1512 + 280/420 = 1792/420
  5. 1792/420 simplified gives 64/15
  6. So, 72/20 + 14/21 = 64/15
    In mixed form: 44/15

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