Add 18/15 and 90/40
1st number: 1 3/15, 2nd number: 2 10/40
18/15 + 90/40 is 69/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
18/15 = 18 × 8/15 × 8 = 144/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
90/40 = 90 × 3/40 × 3 = 270/120 - Add the two like fractions:
144/120 + 270/120 = 144 + 270/120 = 414/120 - 414/120 simplified gives 69/20
- So, 18/15 + 90/40 = 69/20
In mixed form: 39/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15+90/40 18/30+90/40 18/15+90/80 54/15+90/40 18/45+90/40 90/15+90/40 18/75+90/40