Add 21/20 and 10/18
1st number: 1 1/20, 2nd number: 10/18
21/20 + 10/18 is 289/180.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 18 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 18 × 10 = 180,
10/18 = 10 × 10/18 × 10 = 100/180 - Add the two like fractions:
189/180 + 100/180 = 189 + 100/180 = 289/180 - So, 21/20 + 10/18 = 289/180
In mixed form: 1109/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+10/18 21/20+20/18 21/40+10/18 21/20+10/36 63/20+10/18 21/20+30/18 21/60+10/18 21/20+10/54 21/20+50/18 21/20+10/90 21/20+70/18