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Subtract 63/21 from 27/20

1st number: 1 7/20, 2nd number: 3 0/21

27/20 - 63/21 is -33/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420
  2. For the 1st fraction, since 20 × 21 = 420,
    27/20 = 27 × 21/20 × 21 = 567/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    63/21 = 63 × 20/21 × 20 = 1260/420
  4. Subtract the two fractions:
    567/420 - 1260/420 = 567 - 1260/420 = -693/420
  5. After reducing the fraction, the answer is -33/20

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