Compare 12/21 and 28/45
12/21 is smaller than 28/45
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
12/21 = 12 × 15/21 × 15 = 180/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
28/45 = 28 × 7/45 × 7 = 196/315 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 180/315 < 196/315 or 12/21 < 28/45
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 28/45 12/21 and 56/45 12/42 and 28/45 12/21 and 28/90 36/21 and 28/45 12/21 and 84/45 12/63 and 28/45 60/21 and 28/45 84/21 and 28/45