Add 70/20 and 80/70
1st number: 3 10/20, 2nd number: 1 10/70
70/20 + 80/70 is 65/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
70/20 = 70 × 7/20 × 7 = 490/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
80/70 = 80 × 2/70 × 2 = 160/140 - Add the two like fractions:
490/140 + 160/140 = 490 + 160/140 = 650/140 - 650/140 simplified gives 65/14
- So, 70/20 + 80/70 = 65/14
In mixed form: 49/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40+80/70 70/60+80/70