Add 1/20 and 21/16
1st number: 1/20, 2nd number: 1 5/16
1/20 + 21/16 is 109/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 16 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 20 × 4 = 80,
1/20 = 1 × 4/20 × 4 = 4/80 - Likewise, for the 2nd fraction, since 16 × 5 = 80,
21/16 = 21 × 5/16 × 5 = 105/80 - Add the two like fractions:
4/80 + 105/80 = 4 + 105/80 = 109/80 - So, 1/20 + 21/16 = 109/80
In mixed form: 129/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/20+21/16 1/20+42/16 1/40+21/16 1/20+21/32 3/20+21/16 1/20+63/16 1/60+21/16 1/20+21/48 5/20+21/16 1/20+21/80 7/20+21/16