Add 70/15 and 81/18
1st number: 4 10/15, 2nd number: 4 9/18
70/15 + 81/18 is 55/6.
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,
81/18 = 81 × 5/18 × 5 = 405/90 - Add the two like fractions:
420/90 + 405/90 = 420 + 405/90 = 825/90 - 825/90 simplified gives 55/6
- So, 70/15 + 81/18 = 55/6
In mixed form: 91/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/30+81/18 70/15+81/36 70/45+81/18 70/15+81/54 70/75+81/18 70/15+81/90