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Answers.everydaycalculation.com » Compare fractions

Compare 72/21 and 45/42

1st number: 3 9/21, 2nd number: 1 3/42

72/21 is greater than 45/42

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 42 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 21 × 2 = 42,
    72/21 = 72 × 2/21 × 2 = 144/42
  3. Likewise, for the 2nd fraction, since 42 × 1 = 42,
    45/42 = 45 × 1/42 × 1 = 45/42
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 144/42 > 45/42 or 72/21 > 45/42

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