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Subtract 5/4 from 4/21

1st number: 4/21, 2nd number: 1 1/4

4/21 - 5/4 is -89/84.

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,
    4/21 = 4 × 4/21 × 4 = 16/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    5/4 = 5 × 21/4 × 21 = 105/84
  4. Subtract the two fractions:
    16/84 - 105/84 = 16 - 105/84 = -89/84

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