Compare 28/45 and 81/21
1st number: 28/45, 2nd number: 3 18/21
28/45 is smaller than 81/21
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,
28/45 = 28 × 7/45 × 7 = 196/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
81/21 = 81 × 15/21 × 15 = 1215/315 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 196/315 < 1215/315 or 28/45 < 81/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/45 and 81/21 28/90 and 81/21 28/45 and 81/42 84/45 and 81/21 28/45 and 81/63