Compare 42/21 and 84/54
1st number: 2 0/21, 2nd number: 1 30/54
42/21 is greater than 84/54
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
42/21 = 42 × 18/21 × 18 = 756/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
84/54 = 84 × 7/54 × 7 = 588/378 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 756/378 > 588/378 or 42/21 > 84/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21 and 84/54 42/63 and 84/54