Compare 54/15 and 90/21
1st number: 3 9/15, 2nd number: 4 6/21
54/15 is smaller than 90/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
54/15 = 54 × 7/15 × 7 = 378/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
90/21 = 90 × 5/21 × 5 = 450/105 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 378/105 < 450/105 or 54/15 < 90/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/30 and 90/21 54/15 and 90/42 54/45 and 90/21 54/15 and 90/63 54/75 and 90/21