Add 18/15 and 70/90
1st number: 1 3/15, 2nd number: 70/90
18/15 + 70/90 is 89/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
18/15 = 18 × 6/15 × 6 = 108/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
70/90 = 70 × 1/90 × 1 = 70/90 - Add the two like fractions:
108/90 + 70/90 = 108 + 70/90 = 178/90 - 178/90 simplified gives 89/45
- So, 18/15 + 70/90 = 89/45
In mixed form: 144/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15+70/90 18/30+70/90 54/15+70/90 18/45+70/90 90/15+70/90 18/75+70/90