Add 21/18 and 25/9
1st number: 1 3/18, 2nd number: 2 7/9
21/18 + 25/9 is 71/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 9 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 18 × 1 = 18,
21/18 = 21 × 1/18 × 1 = 21/18 - Likewise, for the 2nd fraction, since 9 × 2 = 18,
25/9 = 25 × 2/9 × 2 = 50/18 - Add the two like fractions:
21/18 + 50/18 = 21 + 50/18 = 71/18 - So, 21/18 + 25/9 = 71/18
In mixed form: 317/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+25/9 21/18+50/9 21/36+25/9 21/18+25/18 63/18+25/9 21/18+75/9 21/54+25/9 21/18+25/27 21/90+25/9 21/18+25/45 21/18+25/63