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Answers.everydaycalculation.com » Compare fractions

Compare 21/42 and 15/40

21/42 is greater than 15/40

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 42 × 20 = 840,
    21/42 = 21 × 20/42 × 20 = 420/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    15/40 = 15 × 21/40 × 21 = 315/840
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 420/840 > 315/840 or 21/42 > 15/40

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