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Answers.everydaycalculation.com » Compare fractions

Compare 70/72 and 80/21

1st number: 70/72, 2nd number: 3 17/21

70/72 is smaller than 80/21

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 21 is 504

    Next, find the equivalent fraction of both fractional numbers with denominator 504
  2. For the 1st fraction, since 72 × 7 = 504,
    70/72 = 70 × 7/72 × 7 = 490/504
  3. Likewise, for the 2nd fraction, since 21 × 24 = 504,
    80/21 = 80 × 24/21 × 24 = 1920/504
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 490/504 < 1920/504 or 70/72 < 80/21

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