Compare 81/21 and 30/70
1st number: 3 18/21, 2nd number: 30/70
81/21 is greater than 30/70
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
81/21 = 81 × 10/21 × 10 = 810/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
30/70 = 30 × 3/70 × 3 = 90/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 810/210 > 90/210 or 81/21 > 30/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21 and 60/70 81/42 and 30/70 81/21 and 90/70 81/63 and 30/70