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Subtract 1/90 from 42/56

42/56 - 1/90 is 133/180.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 90 is 2520

    Next, find the equivalent fraction of both fractional numbers with denominator 2520
  2. For the 1st fraction, since 56 × 45 = 2520,
    42/56 = 42 × 45/56 × 45 = 1890/2520
  3. Likewise, for the 2nd fraction, since 90 × 28 = 2520,
    1/90 = 1 × 28/90 × 28 = 28/2520
  4. Subtract the two like fractions:
    1890/2520 - 28/2520 = 1890 - 28/2520 = 1862/2520
  5. After reducing the fraction, the answer is 133/180

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