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Subtract 42/49 from 1/20

1/20 - 42/49 is -113/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 49 is 980

    Next, find the equivalent fraction of both fractional numbers with denominator 980
  2. For the 1st fraction, since 20 × 49 = 980,
    1/20 = 1 × 49/20 × 49 = 49/980
  3. Likewise, for the 2nd fraction, since 49 × 20 = 980,
    42/49 = 42 × 20/49 × 20 = 840/980
  4. Subtract the two like fractions:
    49/980 - 840/980 = 49 - 840/980 = -791/980
  5. After reducing the fraction, the answer is -113/140

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