Compare 42/27 and 21/18
1st number: 1 15/27, 2nd number: 1 3/18
42/27 is greater than 21/18
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 18 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 27 × 2 = 54,
42/27 = 42 × 2/27 × 2 = 84/54 - Likewise, for the 2nd fraction, since 18 × 3 = 54,
21/18 = 21 × 3/18 × 3 = 63/54 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 84/54 > 63/54 or 42/27 > 21/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/27 and 21/18 42/27 and 42/18 42/54 and 21/18 42/27 and 21/36 42/27 and 63/18 42/81 and 21/18 42/27 and 21/54 42/27 and 21/90