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Add 72/20 and 6/21

1st number: 3 12/20, 2nd number: 6/21

72/20 + 6/21 is 136/35.

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,
    6/21 = 6 × 20/21 × 20 = 120/420
  4. Add the two fractions:
    1512/420 + 120/420 = 1512 + 120/420 = 1632/420
  5. 1632/420 simplified gives 136/35
  6. So, 72/20 + 6/21 = 136/35
    In mixed form: 331/35

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