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Subtract 20/40 from 8/18

8/18 - 20/40 is -1/18.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 40 is 360
  2. For the 1st fraction, since 18 × 20 = 360,
    8/18 = 8 × 20/18 × 20 = 160/360
  3. Likewise, for the 2nd fraction, since 40 × 9 = 360,
    20/40 = 20 × 9/40 × 9 = 180/360
  4. Subtract the two fractions:
    160/360 - 180/360 = 160 - 180/360 = -20/360
  5. After reducing the fraction, the answer is -1/18

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