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Add 4/21 and 18/12

1st number: 4/21, 2nd number: 1 6/12

4/21 + 18/12 is 71/42.

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,
    4/21 = 4 × 4/21 × 4 = 16/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    18/12 = 18 × 7/12 × 7 = 126/84
  4. Add the two fractions:
    16/84 + 126/84 = 16 + 126/84 = 142/84
  5. After reducing the fraction, the answer is 71/42
  6. In mixed form: 129/42

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