Compare 15/35 and 21/30
15/35 is smaller than 21/30
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 35 × 6 = 210,
15/35 = 15 × 6/35 × 6 = 90/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 90/210 < 147/210 or 15/35 < 21/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/35 and 21/30 15/35 and 42/30 15/70 and 21/30 15/35 and 21/60 45/35 and 21/30 15/35 and 63/30 15/35 and 21/90 75/35 and 21/30