Compare 21/40 and 18/10
1st number: 21/40, 2nd number: 1 8/10
21/40 is smaller than 18/10
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 10 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
21/40 = 21 × 1/40 × 1 = 21/40 - Likewise, for the 2nd fraction, since 10 × 4 = 40,
18/10 = 18 × 4/10 × 4 = 72/40 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 21/40 < 72/40 or 21/40 < 18/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40 and 18/10 21/40 and 36/10 21/80 and 18/10 21/40 and 18/20 63/40 and 18/10 21/40 and 54/10 21/40 and 18/30 21/40 and 90/10 21/40 and 18/50 21/40 and 18/70