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Subtract 21/5 from 81/18

1st number: 4 9/18, 2nd number: 4 1/5

81/18 - 21/5 is 3/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 5 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 18 × 5 = 90,
    81/18 = 81 × 5/18 × 5 = 405/90
  3. Likewise, for the 2nd fraction, since 5 × 18 = 90,
    21/5 = 21 × 18/5 × 18 = 378/90
  4. Subtract the two like fractions:
    405/90 - 378/90 = 405 - 378/90 = 27/90
  5. After reducing the fraction, the answer is 3/10

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