Answers

Solutions by everydaycalculation.com

Answers.everydaycalculation.com » Compare fractions

Compare 45/27 and 81/21

1st number: 1 18/27, 2nd number: 3 18/21

45/27 is smaller than 81/21

Steps for comparing fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 27 and 21 is 189

    Next, find the equivalent fraction of both fractional numbers with denominator 189
  2. For the 1st fraction, since 27 × 7 = 189,
    45/27 = 45 × 7/27 × 7 = 315/189
  3. Likewise, for the 2nd fraction, since 21 × 9 = 189,
    81/21 = 81 × 9/21 × 9 = 729/189
  4. Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
  5. 315/189 < 729/189 or 45/27 < 81/21

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related:

© everydaycalculation.com