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Subtract 1/40 from 12/18

12/18 - 1/40 is 77/120.

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,
    12/18 = 12 × 20/18 × 20 = 240/360
  3. Likewise, for the 2nd fraction, since 40 × 9 = 360,
    1/40 = 1 × 9/40 × 9 = 9/360
  4. Subtract the two fractions:
    240/360 - 9/360 = 240 - 9/360 = 231/360
  5. After reducing the fraction, the answer is 77/120

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