Add 80/6 and 20/21
1st number: 13 2/6, 2nd number: 20/21
80/6 + 20/21 is 100/7.
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,
80/6 = 80 × 7/6 × 7 = 560/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
20/21 = 20 × 2/21 × 2 = 40/42 - Add the two like fractions:
560/42 + 40/42 = 560 + 40/42 = 600/42 - 600/42 simplified gives 100/7
- So, 80/6 + 20/21 = 100/7
In mixed form: 142/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/6+40/21 80/12+20/21 80/6+20/42 80/6+60/21 80/18+20/21 80/6+20/63 80/30+20/21 80/42+20/21