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Subtract 63/28 from 15/21

1st number: 15/21, 2nd number: 2 7/28

15/21 - 63/28 is -43/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 28 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    15/21 = 15 × 4/21 × 4 = 60/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    63/28 = 63 × 3/28 × 3 = 189/84
  4. Subtract the two fractions:
    60/84 - 189/84 = 60 - 189/84 = -129/84
  5. After reducing the fraction, the answer is -43/28

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