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Answers.everydaycalculation.com » Compare fractions

Compare 90/21 and 81/20

1st number: 4 6/21, 2nd number: 4 1/20

90/21 is greater than 81/20

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    90/21 = 90 × 20/21 × 20 = 1800/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    81/20 = 81 × 21/20 × 21 = 1701/420
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 1800/420 > 1701/420 or 90/21 > 81/20

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