Compare 21/45 and 7/21
21/45 is greater than 7/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
21/45 = 21 × 7/45 × 7 = 147/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
7/21 = 7 × 15/21 × 15 = 105/315 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 147/315 > 105/315 or 21/45 > 7/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45 and 7/21 21/45 and 14/21 21/90 and 7/21 21/45 and 7/42 63/45 and 7/21 21/45 and 7/63 21/45 and 35/21 21/45 and 49/21