Compare 12/21 and 5/15
12/21 is greater than 5/15
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,
12/21 = 12 × 5/21 × 5 = 60/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
5/15 = 5 × 7/15 × 7 = 35/105 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 60/105 > 35/105 or 12/21 > 5/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21 and 5/15 12/21 and 10/15 12/42 and 5/15 12/21 and 5/30 36/21 and 5/15 12/63 and 5/15 12/21 and 5/45 60/21 and 5/15 12/21 and 25/15 12/21 and 5/75 84/21 and 5/15 12/21 and 35/15