Add 8/21 and 21/5
1st number: 8/21, 2nd number: 4 1/5
8/21 + 21/5 is 481/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
8/21 = 8 × 5/21 × 5 = 40/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
21/5 = 21 × 21/5 × 21 = 441/105 - Add the two like fractions:
40/105 + 441/105 = 40 + 441/105 = 481/105 - So, 8/21 + 21/5 = 481/105
In mixed form: 461/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+21/5 8/21+42/5 8/42+21/5 8/21+21/10 24/21+21/5 8/21+63/5 8/63+21/5 8/21+21/15 40/21+21/5 8/21+21/25 56/21+21/5 8/21+21/35