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Compare 15/20 and 1/21

15/20 is greater than 1/21

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420
  2. For the 1st fraction, since 20 × 21 = 420,
    15/20 = 15 × 21/20 × 21 = 315/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    1/21 = 1 × 20/21 × 20 = 20/420
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 315/420 > 20/420 or 15/20 > 1/21

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