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Subtract 18/7 from 9/40

1st number: 9/40, 2nd number: 2 4/7

9/40 - 18/7 is -657/280.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 7 is 280
  2. For the 1st fraction, since 40 × 7 = 280,
    9/40 = 9 × 7/40 × 7 = 63/280
  3. Likewise, for the 2nd fraction, since 7 × 40 = 280,
    18/7 = 18 × 40/7 × 40 = 720/280
  4. Subtract the two fractions:
    63/280 - 720/280 = 63 - 720/280 = -657/280

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