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Subtract 1/21 from 9/12

9/12 - 1/21 is 59/84.

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,
    1/21 = 1 × 4/21 × 4 = 4/84
  4. Subtract the two fractions:
    63/84 - 4/84 = 63 - 4/84 = 59/84

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