Compare 45/20 and 81/30
1st number: 2 5/20, 2nd number: 2 21/30
45/20 is smaller than 81/30
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
45/20 = 45 × 3/20 × 3 = 135/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
81/30 = 81 × 2/30 × 2 = 162/60 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 135/60 < 162/60 or 45/20 < 81/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20 and 81/30 45/40 and 81/30 45/20 and 81/60 45/60 and 81/30 45/20 and 81/90