Add 20/9 and 21/7
1st number: 2 2/9, 2nd number: 3 0/7
20/9 + 21/7 is 47/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 7 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
20/9 = 20 × 7/9 × 7 = 140/63 - Likewise, for the 2nd fraction, since 7 × 9 = 63,
21/7 = 21 × 9/7 × 9 = 189/63 - Add the two like fractions:
140/63 + 189/63 = 140 + 189/63 = 329/63 - 329/63 simplified gives 47/9
- So, 20/9 + 21/7 = 47/9
In mixed form: 52/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/9+21/7 20/9+42/7 20/18+21/7 20/9+21/14 60/9+21/7 20/9+63/7 20/27+21/7 20/45+21/7 20/9+21/35 20/63+21/7 20/9+21/49