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Subtract 5/21 from 81/6

1st number: 13 3/6, 2nd number: 5/21

81/6 - 5/21 is 557/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 6 and 21 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 6 × 7 = 42,
    81/6 = 81 × 7/6 × 7 = 567/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    5/21 = 5 × 2/21 × 2 = 10/42
  4. Subtract the two like fractions:
    567/42 - 10/42 = 567 - 10/42 = 557/42
  5. In mixed form: 1311/42

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