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Subtract 45/7 from 18/40

1st number: 18/40, 2nd number: 6 3/7

18/40 - 45/7 is -837/140.

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,
    18/40 = 18 × 7/40 × 7 = 126/280
  3. Likewise, for the 2nd fraction, since 7 × 40 = 280,
    45/7 = 45 × 40/7 × 40 = 1800/280
  4. Subtract the two fractions:
    126/280 - 1800/280 = 126 - 1800/280 = -1674/280
  5. After reducing the fraction, the answer is -837/140

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