Compare 9/21 and 9/40
9/21 is greater than 9/40
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
9/21 = 9 × 40/21 × 40 = 360/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
9/40 = 9 × 21/40 × 21 = 189/840 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 360/840 > 189/840 or 9/21 > 9/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21 and 9/40 9/21 and 18/40 9/42 and 9/40 9/21 and 9/80 27/21 and 9/40 9/21 and 27/40 9/63 and 9/40 45/21 and 9/40 9/21 and 45/40 63/21 and 9/40 9/21 and 63/40