Compare 7/20 and 45/90
7/20 is smaller than 45/90
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
7/20 = 7 × 9/20 × 9 = 63/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
45/90 = 45 × 2/90 × 2 = 90/180 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 63/180 < 90/180 or 7/20 < 45/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20 and 45/90 7/40 and 45/90 21/20 and 45/90 7/60 and 45/90 35/20 and 45/90 49/20 and 45/90