Add 21/9 and 20/8
1st number: 2 3/9, 2nd number: 2 4/8
21/9 + 20/8 is 29/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 9 × 8 = 72,
21/9 = 21 × 8/9 × 8 = 168/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
20/8 = 20 × 9/8 × 9 = 180/72 - Add the two like fractions:
168/72 + 180/72 = 168 + 180/72 = 348/72 - 348/72 simplified gives 29/6
- So, 21/9 + 20/8 = 29/6
In mixed form: 45/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+20/8 21/9+40/8 21/18+20/8 21/9+20/16 63/9+20/8 21/9+60/8 21/27+20/8 21/9+20/24 21/45+20/8 21/9+20/40 21/63+20/8 21/9+20/56