Add 25/21 and 21/12
1st number: 1 4/21, 2nd number: 1 9/12
25/21 + 21/12 is 247/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
25/21 = 25 × 4/21 × 4 = 100/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
21/12 = 21 × 7/12 × 7 = 147/84 - Add the two like fractions:
100/84 + 147/84 = 100 + 147/84 = 247/84 - So, 25/21 + 21/12 = 247/84
In mixed form: 279/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/21+21/12 25/21+42/12 25/42+21/12 25/21+21/24 75/21+21/12 25/21+63/12 25/63+21/12 25/21+21/36 25/21+21/60 25/21+21/84