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Subtract 3/4 from 10/21

10/21 - 3/4 is -23/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 4 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    10/21 = 10 × 4/21 × 4 = 40/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    3/4 = 3 × 21/4 × 21 = 63/84
  4. Subtract the two fractions:
    40/84 - 63/84 = 40 - 63/84 = -23/84

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