Compare 21/30 and 15/54
21/30 is greater than 15/54
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 30 × 9 = 270,
21/30 = 21 × 9/30 × 9 = 189/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
15/54 = 15 × 5/54 × 5 = 75/270 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 189/270 > 75/270 or 21/30 > 15/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30 and 15/54 21/30 and 30/54 21/60 and 15/54 63/30 and 15/54 21/30 and 45/54 21/90 and 15/54 21/30 and 75/54