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Add 1/21 and 12/9

1st number: 1/21, 2nd number: 1 3/9

1/21 + 12/9 is 29/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    1/21 = 1 × 3/21 × 3 = 3/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    12/9 = 12 × 7/9 × 7 = 84/63
  4. Add the two fractions:
    3/63 + 84/63 = 3 + 84/63 = 87/63
  5. After reducing the fraction, the answer is 29/21
  6. In mixed form: 18/21

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