Add 4/21 and 21/7
1st number: 4/21, 2nd number: 3 0/7
4/21 + 21/7 is 67/21.
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,
4/21 = 4 × 1/21 × 1 = 4/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
21/7 = 21 × 3/7 × 3 = 63/21 - Add the two like fractions:
4/21 + 63/21 = 4 + 63/21 = 67/21 - So, 4/21 + 21/7 = 67/21
In mixed form: 34/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+21/7 4/21+42/7 4/42+21/7 4/21+21/14 12/21+21/7 4/21+63/7 4/63+21/7 20/21+21/7 4/21+21/35 28/21+21/7 4/21+21/49