Compare 42/21 and 18/10
1st number: 2 0/21, 2nd number: 1 8/10
42/21 is greater than 18/10
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
42/21 = 42 × 10/21 × 10 = 420/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
18/10 = 18 × 21/10 × 21 = 378/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 420/210 > 378/210 or 42/21 > 18/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21 and 18/10 42/21 and 36/10 42/21 and 18/20 42/21 and 54/10 42/63 and 18/10 42/21 and 18/30 42/21 and 90/10 42/21 and 18/50 42/21 and 18/70