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Subtract 35/18 from 42/40

1st number: 1 2/40, 2nd number: 1 17/18

42/40 - 35/18 is -161/180.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 18 is 360
  2. For the 1st fraction, since 40 × 9 = 360,
    42/40 = 42 × 9/40 × 9 = 378/360
  3. Likewise, for the 2nd fraction, since 18 × 20 = 360,
    35/18 = 35 × 20/18 × 20 = 700/360
  4. Subtract the two fractions:
    378/360 - 700/360 = 378 - 700/360 = -322/360
  5. After reducing the fraction, the answer is -161/180

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