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Subtract 18/5 from 81/8

1st number: 10 1/8, 2nd number: 3 3/5

81/8 - 18/5 is 261/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 5 is 40

    Next, find the equivalent fraction of both fractional numbers with denominator 40
  2. For the 1st fraction, since 8 × 5 = 40,
    81/8 = 81 × 5/8 × 5 = 405/40
  3. Likewise, for the 2nd fraction, since 5 × 8 = 40,
    18/5 = 18 × 8/5 × 8 = 144/40
  4. Subtract the two like fractions:
    405/40 - 144/40 = 405 - 144/40 = 261/40
  5. In mixed form: 621/40

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