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Subtract 18/10 from 42/80

1st number: 42/80, 2nd number: 1 8/10

42/80 - 18/10 is -51/40.

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,
    18/10 = 18 × 8/10 × 8 = 144/80
  4. Subtract the two like fractions:
    42/80 - 144/80 = 42 - 144/80 = -102/80
  5. After reducing the fraction, the answer is -51/40

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