Add 7/21 and 1/9
7/21 + 1/9 is 4/9.
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,
7/21 = 7 × 3/21 × 3 = 21/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
1/9 = 1 × 7/9 × 7 = 7/63 - Add the two like fractions:
21/63 + 7/63 = 21 + 7/63 = 28/63 - 28/63 simplified gives 4/9
- So, 7/21 + 1/9 = 4/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+1/9 7/21+2/9 7/42+1/9 7/21+1/18 7/21+3/9 7/63+1/9 7/21+1/27 35/21+1/9 7/21+5/9 7/21+1/45 49/21+1/9 7/21+7/9 7/21+1/63