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Subtract 90/20 from 1/21

1st number: 1/21, 2nd number: 4 10/20

1/21 - 90/20 is -187/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    1/21 = 1 × 20/21 × 20 = 20/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    90/20 = 90 × 21/20 × 21 = 1890/420
  4. Subtract the two like fractions:
    20/420 - 1890/420 = 20 - 1890/420 = -1870/420
  5. After reducing the fraction, the answer is -187/42

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