Compare 42/21 and 63/30
1st number: 2 0/21, 2nd number: 2 3/30
42/21 is smaller than 63/30
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,
42/21 = 42 × 10/21 × 10 = 420/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
63/30 = 63 × 7/30 × 7 = 441/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 420/210 < 441/210 or 42/21 < 63/30
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 63/30 42/21 and 63/60 42/63 and 63/30 42/21 and 63/90