Compare 5/15 and 21/7
1st number: 5/15, 2nd number: 3 0/7
5/15 is smaller than 21/7
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 7 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
5/15 = 5 × 7/15 × 7 = 35/105 - Likewise, for the 2nd fraction, since 7 × 15 = 105,
21/7 = 21 × 15/7 × 15 = 315/105 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 35/105 < 315/105 or 5/15 < 21/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/15 and 21/7 5/15 and 42/7 5/30 and 21/7 5/15 and 21/14 5/15 and 63/7 5/45 and 21/7 25/15 and 21/7 5/75 and 21/7 5/15 and 21/35 35/15 and 21/7 5/15 and 21/49