Compare 21/81 and 24/12
1st number: 21/81, 2nd number: 2 0/12
21/81 is smaller than 24/12
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 12 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
21/81 = 21 × 4/81 × 4 = 84/324 - Likewise, for the 2nd fraction, since 12 × 27 = 324,
24/12 = 24 × 27/12 × 27 = 648/324 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 84/324 < 648/324 or 21/81 < 24/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81 and 24/12 21/81 and 48/12 63/81 and 24/12 21/81 and 72/12 21/81 and 24/36 21/81 and 24/60 21/81 and 24/84