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Add 15/21 and 4/9

15/21 + 4/9 is 73/63.

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,
    15/21 = 15 × 3/21 × 3 = 45/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    4/9 = 4 × 7/9 × 7 = 28/63
  4. Add the two fractions:
    45/63 + 28/63 = 45 + 28/63 = 73/63
  5. In mixed form: 110/63

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