Add 70/15 and 80/18
1st number: 4 10/15, 2nd number: 4 8/18
70/15 + 80/18 is 82/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
70/15 = 70 × 6/15 × 6 = 420/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
80/18 = 80 × 5/18 × 5 = 400/90 - Add the two like fractions:
420/90 + 400/90 = 420 + 400/90 = 820/90 - 820/90 simplified gives 82/9
- So, 70/15 + 80/18 = 82/9
In mixed form: 91/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/30+80/18 70/15+80/36 70/45+80/18 70/15+80/54 70/75+80/18 70/15+80/90