Compare 81/16 and 21/40
1st number: 5 1/16, 2nd number: 21/40
81/16 is greater than 21/40
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 40 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 16 × 5 = 80,
81/16 = 81 × 5/16 × 5 = 405/80 - Likewise, for the 2nd fraction, since 40 × 2 = 80,
21/40 = 21 × 2/40 × 2 = 42/80 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 405/80 > 42/80 or 81/16 > 21/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/16 and 42/40 81/32 and 21/40 81/16 and 21/80 81/16 and 63/40 81/48 and 21/40 81/80 and 21/40