Add 1/21 and 7/9
1/21 + 7/9 is 52/63.
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,
1/21 = 1 × 3/21 × 3 = 3/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
7/9 = 7 × 7/9 × 7 = 49/63 - Add the two like fractions:
3/63 + 49/63 = 3 + 49/63 = 52/63 - So, 1/21 + 7/9 = 52/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+7/9 1/21+14/9 1/42+7/9 1/21+7/18 3/21+7/9 1/21+21/9 1/63+7/9 1/21+7/27 5/21+7/9 1/21+35/9 1/21+7/45 7/21+7/9 1/21+49/9 1/21+7/63