Add 7/4 and 21/20
1st number: 1 3/4, 2nd number: 1 1/20
7/4 + 21/20 is 14/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
7/4 = 7 × 5/4 × 5 = 35/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
21/20 = 21 × 1/20 × 1 = 21/20 - Add the two like fractions:
35/20 + 21/20 = 35 + 21/20 = 56/20 - 56/20 simplified gives 14/5
- So, 7/4 + 21/20 = 14/5
In mixed form: 24/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/4+21/20 7/4+42/20 7/8+21/20 7/4+21/40 21/4+21/20 7/4+63/20 7/12+21/20 7/4+21/60 35/4+21/20 7/20+21/20 49/4+21/20 7/28+21/20