Compare 21/40 and 80/50
1st number: 21/40, 2nd number: 1 30/50
21/40 is smaller than 80/50
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 50 is 200
Next, find the equivalent fraction of both fractional numbers with denominator 200 - For the 1st fraction, since 40 × 5 = 200,
21/40 = 21 × 5/40 × 5 = 105/200 - Likewise, for the 2nd fraction, since 50 × 4 = 200,
80/50 = 80 × 4/50 × 4 = 320/200 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 105/200 < 320/200 or 21/40 < 80/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40 and 80/50 21/80 and 80/50 63/40 and 80/50