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Answers.everydaycalculation.com » Compare fractions

Compare 12/21 and 18/40

12/21 is greater than 18/40

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,
    12/21 = 12 × 40/21 × 40 = 480/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    18/40 = 18 × 21/40 × 21 = 378/840
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 480/840 > 378/840 or 12/21 > 18/40

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