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Subtract 2/5 from 12/40

12/40 - 2/5 is -1/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 5 is 40
  2. For the 1st fraction, since 40 × 1 = 40,
    12/40 = 12 × 1/40 × 1 = 12/40
  3. Likewise, for the 2nd fraction, since 5 × 8 = 40,
    2/5 = 2 × 8/5 × 8 = 16/40
  4. Subtract the two fractions:
    12/40 - 16/40 = 12 - 16/40 = -4/40
  5. After reducing the fraction, the answer is -1/10

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