Add 21/9 and 20/40
1st number: 2 3/9, 2nd number: 20/40
21/9 + 20/40 is 17/6.
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,
20/40 = 20 × 9/40 × 9 = 180/360 - Add the two like fractions:
840/360 + 180/360 = 840 + 180/360 = 1020/360 - 1020/360 simplified gives 17/6
- So, 21/9 + 20/40 = 17/6
In mixed form: 25/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+20/40 21/18+20/40 21/9+20/80 63/9+20/40 21/9+60/40 21/27+20/40 21/45+20/40 21/63+20/40