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Subtract 25/21 from 1/20

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

1/20 - 25/21 is -479/420.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 20 × 21 = 420,
    1/20 = 1 × 21/20 × 21 = 21/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    25/21 = 25 × 20/21 × 20 = 500/420
  4. Subtract the two like fractions:
    21/420 - 500/420 = 21 - 500/420 = -479/420

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