Add 80/30 and 21/9
1st number: 2 20/30, 2nd number: 2 3/9
80/30 + 21/9 is 5/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
80/30 = 80 × 3/30 × 3 = 240/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
21/9 = 21 × 10/9 × 10 = 210/90 - Add the two like fractions:
240/90 + 210/90 = 240 + 210/90 = 450/90 - 450/90 simplified gives 5/1
- So, 80/30 + 21/9 = 5/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30+42/9 80/60+21/9 80/30+21/18 80/30+63/9 80/90+21/9 80/30+21/27 80/30+21/45 80/30+21/63