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Add 4/21 and 3/9

4/21 + 3/9 is 11/21.

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,
    4/21 = 4 × 3/21 × 3 = 12/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    3/9 = 3 × 7/9 × 7 = 21/63
  4. Add the two fractions:
    12/63 + 21/63 = 12 + 21/63 = 33/63
  5. After reducing the fraction, the answer is 11/21

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