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Subtract 3/9 from 6/21

6/21 - 3/9 is -1/21.

Steps for subtracting 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,
    6/21 = 6 × 3/21 × 3 = 18/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    3/9 = 3 × 7/9 × 7 = 21/63
  4. Subtract the two fractions:
    18/63 - 21/63 = 18 - 21/63 = -3/63
  5. After reducing the fraction, the answer is -1/21

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