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Answers.everydaycalculation.com » Compare fractions

Compare 18/21 and 81/40

1st number: 18/21, 2nd number: 2 1/40

18/21 is smaller than 81/40

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 21 × 40 = 840,
    18/21 = 18 × 40/21 × 40 = 720/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    81/40 = 81 × 21/40 × 21 = 1701/840
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 720/840 < 1701/840 or 18/21 < 81/40

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