Compare 30/8 and 72/21
1st number: 3 6/8, 2nd number: 3 9/21
30/8 is greater than 72/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
30/8 = 30 × 21/8 × 21 = 630/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
72/21 = 72 × 8/21 × 8 = 576/168 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 630/168 > 576/168 or 30/8 > 72/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/8 and 72/21 30/16 and 72/21 30/8 and 72/42 90/8 and 72/21 30/24 and 72/21 30/8 and 72/63 30/40 and 72/21 30/56 and 72/21