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Subtract 8/10 from 42/80

42/80 - 8/10 is -11/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 10 is 80

    Next, find the equivalent fraction of both fractional numbers with denominator 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 10 × 8 = 80,
    8/10 = 8 × 8/10 × 8 = 64/80
  4. Subtract the two like fractions:
    42/80 - 64/80 = 42 - 64/80 = -22/80
  5. After reducing the fraction, the answer is -11/40

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