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Subtract 1/20 from 42/54

42/54 - 1/20 is 131/180.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 20 is 540

    Next, find the equivalent fraction of both fractional numbers with denominator 540
  2. For the 1st fraction, since 54 × 10 = 540,
    42/54 = 42 × 10/54 × 10 = 420/540
  3. Likewise, for the 2nd fraction, since 20 × 27 = 540,
    1/20 = 1 × 27/20 × 27 = 27/540
  4. Subtract the two like fractions:
    420/540 - 27/540 = 420 - 27/540 = 393/540
  5. After reducing the fraction, the answer is 131/180

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