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Subtract 21/20 from 1/4

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

1/4 - 21/20 is -4/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 20 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 4 × 5 = 20,
    1/4 = 1 × 5/4 × 5 = 5/20
  3. Likewise, for the 2nd fraction, since 20 × 1 = 20,
    21/20 = 21 × 1/20 × 1 = 21/20
  4. Subtract the two like fractions:
    5/20 - 21/20 = 5 - 21/20 = -16/20
  5. After reducing the fraction, the answer is -4/5

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