Add 20/21 and 80/70
1st number: 20/21, 2nd number: 1 10/70
20/21 + 80/70 is 44/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
20/21 = 20 × 10/21 × 10 = 200/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
80/70 = 80 × 3/70 × 3 = 240/210 - Add the two like fractions:
200/210 + 240/210 = 200 + 240/210 = 440/210 - 440/210 simplified gives 44/21
- So, 20/21 + 80/70 = 44/21
In mixed form: 22/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+80/70 20/42+80/70 60/21+80/70 20/63+80/70