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Subtract 12/20 from 42/80

42/80 - 12/20 is -3/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 20 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 20 × 4 = 80,
    12/20 = 12 × 4/20 × 4 = 48/80
  4. Subtract the two fractions:
    42/80 - 48/80 = 42 - 48/80 = -6/80
  5. After reducing the fraction, the answer is -3/40

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