Add 4/21 and 21/9
1st number: 4/21, 2nd number: 2 3/9
4/21 + 21/9 is 53/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
4/21 = 4 × 3/21 × 3 = 12/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
21/9 = 21 × 7/9 × 7 = 147/63 - Add the two like fractions:
12/63 + 147/63 = 12 + 147/63 = 159/63 - 159/63 simplified gives 53/21
- So, 4/21 + 21/9 = 53/21
In mixed form: 211/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+21/9 4/21+42/9 4/42+21/9 4/21+21/18 12/21+21/9 4/21+63/9 4/63+21/9 4/21+21/27 20/21+21/9 4/21+21/45 28/21+21/9 4/21+21/63