Add 21/72 and 80/9
1st number: 21/72, 2nd number: 8 8/9
21/72 + 80/9 is 661/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 9 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 72 × 1 = 72,
21/72 = 21 × 1/72 × 1 = 21/72 - Likewise, for the 2nd fraction, since 9 × 8 = 72,
80/9 = 80 × 8/9 × 8 = 640/72 - Add the two like fractions:
21/72 + 640/72 = 21 + 640/72 = 661/72 - So, 21/72 + 80/9 = 661/72
In mixed form: 913/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72+80/9 21/72+80/18 63/72+80/9 21/72+80/27 21/72+80/45 21/72+80/63