Add 20/15 and 90/12
1st number: 1 5/15, 2nd number: 7 6/12
20/15 + 90/12 is 53/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
20/15 = 20 × 4/15 × 4 = 80/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
90/12 = 90 × 5/12 × 5 = 450/60 - Add the two like fractions:
80/60 + 450/60 = 80 + 450/60 = 530/60 - 530/60 simplified gives 53/6
- So, 20/15 + 90/12 = 53/6
In mixed form: 85/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15+90/12 20/30+90/12 20/15+90/24 60/15+90/12 20/45+90/12 20/15+90/36 20/75+90/12 20/15+90/60 20/15+90/84