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Subtract 9/21 from 9/28

9/28 - 9/21 is -3/28.

Steps for subtracting fractions

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

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