Compare 21/40 and 3/45
21/40 is greater than 3/45
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 45 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
21/40 = 21 × 9/40 × 9 = 189/360 - Likewise, for the 2nd fraction, since 45 × 8 = 360,
3/45 = 3 × 8/45 × 8 = 24/360 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 189/360 > 24/360 or 21/40 > 3/45
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 3/45 21/40 and 6/45 21/80 and 3/45 21/40 and 3/90 63/40 and 3/45 21/40 and 9/45 21/40 and 15/45 21/40 and 21/45