Compare 5/21 and 20/15
1st number: 5/21, 2nd number: 1 5/15
5/21 is smaller than 20/15
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
5/21 = 5 × 5/21 × 5 = 25/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
20/15 = 20 × 7/15 × 7 = 140/105 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 25/105 < 140/105 or 5/21 < 20/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21 and 20/15 5/21 and 40/15 5/42 and 20/15 5/21 and 20/30 15/21 and 20/15 5/21 and 60/15 5/63 and 20/15 5/21 and 20/45 25/21 and 20/15 5/21 and 20/75 35/21 and 20/15