Add 10/21 and 21/7
1st number: 10/21, 2nd number: 3 0/7
10/21 + 21/7 is 73/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
10/21 = 10 × 1/21 × 1 = 10/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
21/7 = 21 × 3/7 × 3 = 63/21 - Add the two like fractions:
10/21 + 63/21 = 10 + 63/21 = 73/21 - So, 10/21 + 21/7 = 73/21
In mixed form: 310/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+21/7 10/21+42/7 10/42+21/7 10/21+21/14 30/21+21/7 10/21+63/7 10/63+21/7 50/21+21/7 10/21+21/35 70/21+21/7 10/21+21/49