Add 21/9 and 3/40
1st number: 2 3/9, 2nd number: 3/40
21/9 + 3/40 is 289/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 9 × 40 = 360,
21/9 = 21 × 40/9 × 40 = 840/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
3/40 = 3 × 9/40 × 9 = 27/360 - Add the two like fractions:
840/360 + 27/360 = 840 + 27/360 = 867/360 - 867/360 simplified gives 289/120
- So, 21/9 + 3/40 = 289/120
In mixed form: 249/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+3/40 21/9+6/40 21/18+3/40 21/9+3/80 63/9+3/40 21/9+9/40 21/27+3/40 21/9+15/40 21/45+3/40 21/9+21/40 21/63+3/40