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Subtract 63/4 from 15/21

1st number: 15/21, 2nd number: 15 3/4

15/21 - 63/4 is -421/28.

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,
    15/21 = 15 × 4/21 × 4 = 60/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    63/4 = 63 × 21/4 × 21 = 1323/84
  4. Subtract the two fractions:
    60/84 - 1323/84 = 60 - 1323/84 = -1263/84
  5. After reducing the fraction, the answer is -421/28

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