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Add 40/21 and 9/12

1st number: 1 19/21, 2nd number: 9/12

40/21 + 9/12 is 223/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    40/21 = 40 × 4/21 × 4 = 160/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    9/12 = 9 × 7/12 × 7 = 63/84
  4. Add the two fractions:
    160/84 + 63/84 = 160 + 63/84 = 223/84
  5. In mixed form: 255/84

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