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Subtract 9/21 from 63/4

1st number: 15 3/4, 2nd number: 9/21

63/4 - 9/21 is 429/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 21 is 84
  2. For the 1st fraction, since 4 × 21 = 84,
    63/4 = 63 × 21/4 × 21 = 1323/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    9/21 = 9 × 4/21 × 4 = 36/84
  4. Subtract the two fractions:
    1323/84 - 36/84 = 1323 - 36/84 = 1287/84
  5. After reducing the fraction, the answer is 429/28
  6. In mixed form: 159/28

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