Compare 21/45 and 5/7
21/45 is smaller than 5/7
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 7 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 7 × 45 = 315,
5/7 = 5 × 45/7 × 45 = 225/315 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 147/315 < 225/315 or 21/45 < 5/7
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 5/7 21/45 and 10/7 21/90 and 5/7 21/45 and 5/14 63/45 and 5/7 21/45 and 15/7 21/45 and 5/21 21/45 and 25/7 21/45 and 5/35 21/45 and 35/7 21/45 and 5/49