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Subtract 3/5 from 21/20

1st number: 1 1/20, 2nd number: 3/5

21/20 - 3/5 is 9/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 5 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 20 × 1 = 20,
    21/20 = 21 × 1/20 × 1 = 21/20
  3. Likewise, for the 2nd fraction, since 5 × 4 = 20,
    3/5 = 3 × 4/5 × 4 = 12/20
  4. Subtract the two like fractions:
    21/20 - 12/20 = 21 - 12/20 = 9/20

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