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Answers.everydaycalculation.com » Compare fractions

Compare 9/12 and 81/21

1st number: 9/12, 2nd number: 3 18/21

9/12 is smaller than 81/21

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 21 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 12 × 7 = 84,
    9/12 = 9 × 7/12 × 7 = 63/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    81/21 = 81 × 4/21 × 4 = 324/84
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 63/84 < 324/84 or 9/12 < 81/21

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