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Subtract 63/70 from 27/40

27/40 - 63/70 is -9/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 70 is 280
  2. For the 1st fraction, since 40 × 7 = 280,
    27/40 = 27 × 7/40 × 7 = 189/280
  3. Likewise, for the 2nd fraction, since 70 × 4 = 280,
    63/70 = 63 × 4/70 × 4 = 252/280
  4. Subtract the two fractions:
    189/280 - 252/280 = 189 - 252/280 = -63/280
  5. After reducing the fraction, the answer is -9/40

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