Compare 45/30 and 21/7
1st number: 1 15/30, 2nd number: 3 0/7
45/30 is smaller than 21/7
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 7 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
45/30 = 45 × 7/30 × 7 = 315/210 - Likewise, for the 2nd fraction, since 7 × 30 = 210,
21/7 = 21 × 30/7 × 30 = 630/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 315/210 < 630/210 or 45/30 < 21/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30 and 21/7 45/30 and 42/7 45/60 and 21/7 45/30 and 21/14 45/30 and 63/7 45/90 and 21/7 45/30 and 21/35 45/30 and 21/49