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Compare 63/18 and 81/21

1st number: 3 9/18, 2nd number: 3 18/21

63/18 is smaller than 81/21

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 21 is 126
  2. For the 1st fraction, since 18 × 7 = 126,
    63/18 = 63 × 7/18 × 7 = 441/126
  3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
    81/21 = 81 × 6/21 × 6 = 486/126
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 441/126 < 486/126 or 63/18 < 81/21

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