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Subtract 63/20 from 15/21

1st number: 15/21, 2nd number: 3 3/20

15/21 - 63/20 is -341/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420
  2. For the 1st fraction, since 21 × 20 = 420,
    15/21 = 15 × 20/21 × 20 = 300/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    63/20 = 63 × 21/20 × 21 = 1323/420
  4. Subtract the two fractions:
    300/420 - 1323/420 = 300 - 1323/420 = -1023/420
  5. After reducing the fraction, the answer is -341/140

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