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Subtract 18/5 from 81/4

1st number: 20 1/4, 2nd number: 3 3/5

81/4 - 18/5 is 333/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 5 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 4 × 5 = 20,
    81/4 = 81 × 5/4 × 5 = 405/20
  3. Likewise, for the 2nd fraction, since 5 × 4 = 20,
    18/5 = 18 × 4/5 × 4 = 72/20
  4. Subtract the two like fractions:
    405/20 - 72/20 = 405 - 72/20 = 333/20
  5. In mixed form: 1613/20

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