Add 21/80 and 56/9
1st number: 21/80, 2nd number: 6 2/9
21/80 + 56/9 is 4669/720.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 9 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
21/80 = 21 × 9/80 × 9 = 189/720 - Likewise, for the 2nd fraction, since 9 × 80 = 720,
56/9 = 56 × 80/9 × 80 = 4480/720 - Add the two like fractions:
189/720 + 4480/720 = 189 + 4480/720 = 4669/720 - So, 21/80 + 56/9 = 4669/720
In mixed form: 6349/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+56/9 21/80+56/18 63/80+56/9 21/80+56/27 21/80+56/45 21/80+56/63