Add 21/20 and 1/9
1st number: 1 1/20, 2nd number: 1/9
21/20 + 1/9 is 209/180.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
21/20 = 21 × 9/20 × 9 = 189/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
1/9 = 1 × 20/9 × 20 = 20/180 - Add the two like fractions:
189/180 + 20/180 = 189 + 20/180 = 209/180 - So, 21/20 + 1/9 = 209/180
In mixed form: 129/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+1/9 21/20+2/9 21/40+1/9 21/20+1/18 63/20+1/9 21/20+3/9 21/60+1/9 21/20+1/27 21/20+5/9 21/20+1/45 21/20+7/9 21/20+1/63