Add 21/6 and 80/21
1st number: 3 3/6, 2nd number: 3 17/21
21/6 + 80/21 is 307/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 6 × 7 = 42,
21/6 = 21 × 7/6 × 7 = 147/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
80/21 = 80 × 2/21 × 2 = 160/42 - Add the two like fractions:
147/42 + 160/42 = 147 + 160/42 = 307/42 - So, 21/6 + 80/21 = 307/42
In mixed form: 713/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6+80/21 21/12+80/21 21/6+80/42 63/6+80/21 21/18+80/21 21/6+80/63 21/30+80/21 21/42+80/21