Compare 21/15 and 90/54
1st number: 1 6/15, 2nd number: 1 36/54
21/15 is smaller than 90/54
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 15 × 18 = 270,
21/15 = 21 × 18/15 × 18 = 378/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
90/54 = 90 × 5/54 × 5 = 450/270 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 378/270 < 450/270 or 21/15 < 90/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15 and 90/54 21/30 and 90/54 63/15 and 90/54 21/45 and 90/54 21/75 and 90/54