Compare 21/84 and 5/80
21/84 is greater than 5/80
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 84 × 20 = 1680,
21/84 = 21 × 20/84 × 20 = 420/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
5/80 = 5 × 21/80 × 21 = 105/1680 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 420/1680 > 105/1680 or 21/84 > 5/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84 and 5/80 21/84 and 10/80 63/84 and 5/80 21/84 and 15/80 21/84 and 25/80 21/84 and 35/80