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Subtract 15/4 from 28/21

1st number: 1 7/21, 2nd number: 3 3/4

28/21 - 15/4 is -29/12.

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,
    28/21 = 28 × 4/21 × 4 = 112/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    15/4 = 15 × 21/4 × 21 = 315/84
  4. Subtract the two fractions:
    112/84 - 315/84 = 112 - 315/84 = -203/84
  5. After reducing the fraction, the answer is -29/12

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