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Subtract 6/40 from 42/80

42/80 - 6/40 is 3/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 40 is 80
  2. For the 1st fraction, since 80 × 1 = 80,
    42/80 = 42 × 1/80 × 1 = 42/80
  3. Likewise, for the 2nd fraction, since 40 × 2 = 80,
    6/40 = 6 × 2/40 × 2 = 12/80
  4. Subtract the two fractions:
    42/80 - 12/80 = 42 - 12/80 = 30/80
  5. After reducing the fraction, the answer is 3/8

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