Add 21/25 and 21/20
1st number: 21/25, 2nd number: 1 1/20
21/25 + 21/20 is 189/100.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 20 is 100
Next, find the equivalent fraction of both fractional numbers with denominator 100 - For the 1st fraction, since 25 × 4 = 100,
21/25 = 21 × 4/25 × 4 = 84/100 - Likewise, for the 2nd fraction, since 20 × 5 = 100,
21/20 = 21 × 5/20 × 5 = 105/100 - Add the two like fractions:
84/100 + 105/100 = 84 + 105/100 = 189/100 - So, 21/25 + 21/20 = 189/100
In mixed form: 189/100
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25+21/20 21/25+42/20 21/50+21/20 21/25+21/40 63/25+21/20 21/25+63/20 21/75+21/20 21/25+21/60