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Subtract 63/42 from 27/40

1st number: 27/40, 2nd number: 1 21/42

27/40 - 63/42 is -33/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 42 is 840
  2. For the 1st fraction, since 40 × 21 = 840,
    27/40 = 27 × 21/40 × 21 = 567/840
  3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
    63/42 = 63 × 20/42 × 20 = 1260/840
  4. Subtract the two fractions:
    567/840 - 1260/840 = 567 - 1260/840 = -693/840
  5. After reducing the fraction, the answer is -33/40

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