Compare 20/21 and 5/7
20/21 is greater than 5/7
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
20/21 = 20 × 1/21 × 1 = 20/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
5/7 = 5 × 3/7 × 3 = 15/21 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 20/21 > 15/21 or 20/21 > 5/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21 and 5/7 20/21 and 10/7 20/42 and 5/7 20/21 and 5/14 60/21 and 5/7 20/21 and 15/7 20/63 and 5/7 20/21 and 5/21 20/21 and 25/7 20/21 and 5/35 20/21 and 35/7 20/21 and 5/49