Compare 15/70 and 21/40
15/70 is smaller than 21/40
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
15/70 = 15 × 4/70 × 4 = 60/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
21/40 = 21 × 7/40 × 7 = 147/280 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 60/280 < 147/280 or 15/70 < 21/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70 and 21/40 15/70 and 42/40 15/70 and 21/80 45/70 and 21/40 15/70 and 63/40 75/70 and 21/40