Add 80/9 and 21/4
1st number: 8 8/9, 2nd number: 5 1/4
80/9 + 21/4 is 509/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 4 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 9 × 4 = 36,
80/9 = 80 × 4/9 × 4 = 320/36 - Likewise, for the 2nd fraction, since 4 × 9 = 36,
21/4 = 21 × 9/4 × 9 = 189/36 - Add the two like fractions:
320/36 + 189/36 = 320 + 189/36 = 509/36 - So, 80/9 + 21/4 = 509/36
In mixed form: 145/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/9+42/4 80/18+21/4 80/9+21/8 80/9+63/4 80/27+21/4 80/9+21/12 80/45+21/4 80/9+21/20 80/63+21/4 80/9+21/28