Add 70/30 and 80/70
1st number: 2 10/30, 2nd number: 1 10/70
70/30 + 80/70 is 73/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
70/30 = 70 × 7/30 × 7 = 490/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
80/70 = 80 × 3/70 × 3 = 240/210 - Add the two like fractions:
490/210 + 240/210 = 490 + 240/210 = 730/210 - 730/210 simplified gives 73/21
- So, 70/30 + 80/70 = 73/21
In mixed form: 310/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/60+80/70 70/90+80/70