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Compare 7/21 and 4/5

7/21 is smaller than 4/5

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    7/21 = 7 × 5/21 × 5 = 35/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    4/5 = 4 × 21/5 × 21 = 84/105
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 35/105 < 84/105 or 7/21 < 4/5

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