Add 20/15 and 90/8
1st number: 1 5/15, 2nd number: 11 2/8
20/15 + 90/8 is 151/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
20/15 = 20 × 8/15 × 8 = 160/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
90/8 = 90 × 15/8 × 15 = 1350/120 - Add the two like fractions:
160/120 + 1350/120 = 160 + 1350/120 = 1510/120 - 1510/120 simplified gives 151/12
- So, 20/15 + 90/8 = 151/12
In mixed form: 127/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15+90/8 20/30+90/8 20/15+90/16 60/15+90/8 20/45+90/8 20/15+90/24 20/75+90/8 20/15+90/40 20/15+90/56