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Compare 21/42 and 5/8

21/42 is smaller than 5/8

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 8 is 168
  2. For the 1st fraction, since 42 × 4 = 168,
    21/42 = 21 × 4/42 × 4 = 84/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    5/8 = 5 × 21/8 × 21 = 105/168
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 84/168 < 105/168 or 21/42 < 5/8

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