Compare 25/21 and 42/30
1st number: 1 4/21, 2nd number: 1 12/30
25/21 is smaller than 42/30
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
25/21 = 25 × 10/21 × 10 = 250/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 250/210 < 294/210 or 25/21 < 42/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/21 and 42/30 25/21 and 84/30 25/42 and 42/30 25/21 and 42/60 75/21 and 42/30 25/63 and 42/30 25/21 and 42/90