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Subtract 9/21 from 9/12

9/12 - 9/21 is 9/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 21 is 84
  2. For the 1st fraction, since 12 × 7 = 84,
    9/12 = 9 × 7/12 × 7 = 63/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    9/21 = 9 × 4/21 × 4 = 36/84
  4. Subtract the two fractions:
    63/84 - 36/84 = 63 - 36/84 = 27/84
  5. After reducing the fraction, the answer is 9/28

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