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Subtract 42/90 from 18/40

18/40 - 42/90 is -1/60.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 90 is 360
  2. For the 1st fraction, since 40 × 9 = 360,
    18/40 = 18 × 9/40 × 9 = 162/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    42/90 = 42 × 4/90 × 4 = 168/360
  4. Subtract the two fractions:
    162/360 - 168/360 = 162 - 168/360 = -6/360
  5. After reducing the fraction, the answer is -1/60

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