Compare 42/12 and 21/81
1st number: 3 6/12, 2nd number: 21/81
42/12 is greater than 21/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 12 × 27 = 324,
42/12 = 42 × 27/12 × 27 = 1134/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
21/81 = 21 × 4/81 × 4 = 84/324 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 1134/324 > 84/324 or 42/12 > 21/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12 and 21/81 42/12 and 42/81 42/24 and 21/81 42/12 and 63/81 42/36 and 21/81 42/60 and 21/81 42/84 and 21/81