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Add 1/21 and 3/9

1/21 + 3/9 is 8/21.

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,
    3/9 = 3 × 7/9 × 7 = 21/63
  4. Add the two fractions:
    3/63 + 21/63 = 3 + 21/63 = 24/63
  5. 24/63 simplified gives 8/21
  6. So, 1/21 + 3/9 = 8/21

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