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Answers.everydaycalculation.com » Compare fractions

Compare 15/4 and 21/81

1st number: 3 3/4, 2nd number: 21/81

15/4 is greater than 21/81

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 81 is 324

    Next, find the equivalent fraction of both fractional numbers with denominator 324
  2. For the 1st fraction, since 4 × 81 = 324,
    15/4 = 15 × 81/4 × 81 = 1215/324
  3. Likewise, for the 2nd fraction, since 81 × 4 = 324,
    21/81 = 21 × 4/81 × 4 = 84/324
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 1215/324 > 84/324 or 15/4 > 21/81

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