Compare 4/21 and 20/18
1st number: 4/21, 2nd number: 1 2/18
4/21 is smaller than 20/18
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
4/21 = 4 × 6/21 × 6 = 24/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
20/18 = 20 × 7/18 × 7 = 140/126 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 24/126 < 140/126 or 4/21 < 20/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21 and 20/18 4/21 and 40/18 4/42 and 20/18 4/21 and 20/36 12/21 and 20/18 4/21 and 60/18 4/63 and 20/18 4/21 and 20/54 20/21 and 20/18 4/21 and 20/90 28/21 and 20/18