Add 21/20 and 3/18
1st number: 1 1/20, 2nd number: 3/18
21/20 + 3/18 is 73/60.
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,
3/18 = 3 × 10/18 × 10 = 30/180 - Add the two like fractions:
189/180 + 30/180 = 189 + 30/180 = 219/180 - 219/180 simplified gives 73/60
- So, 21/20 + 3/18 = 73/60
In mixed form: 113/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+3/18 21/20+6/18 21/40+3/18 21/20+3/36 63/20+3/18 21/20+9/18 21/60+3/18 21/20+3/54 21/20+15/18 21/20+3/90 21/20+21/18