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Answers.everydaycalculation.com » Compare fractions

Compare 21/42 and 15/9

1st number: 21/42, 2nd number: 1 6/9

21/42 is smaller than 15/9

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 9 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 42 × 3 = 126,
    21/42 = 21 × 3/42 × 3 = 63/126
  3. Likewise, for the 2nd fraction, since 9 × 14 = 126,
    15/9 = 15 × 14/9 × 14 = 210/126
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 63/126 < 210/126 or 21/42 < 15/9

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