Add 18/20 and 21/4
1st number: 18/20, 2nd number: 5 1/4
18/20 + 21/4 is 123/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 4 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
18/20 = 18 × 1/20 × 1 = 18/20 - Likewise, for the 2nd fraction, since 4 × 5 = 20,
21/4 = 21 × 5/4 × 5 = 105/20 - Add the two like fractions:
18/20 + 105/20 = 18 + 105/20 = 123/20 - So, 18/20 + 21/4 = 123/20
In mixed form: 63/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20+21/4 18/20+42/4 18/40+21/4 18/20+21/8 54/20+21/4 18/20+63/4 18/60+21/4 18/20+21/12 90/20+21/4 18/20+21/20 18/20+21/28