Add 8/12 and 42/90
8/12 + 42/90 is 17/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
8/12 = 8 × 15/12 × 15 = 120/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
42/90 = 42 × 2/90 × 2 = 84/180 - Add the two like fractions:
120/180 + 84/180 = 120 + 84/180 = 204/180 - 204/180 simplified gives 17/15
- So, 8/12 + 42/90 = 17/15
In mixed form: 12/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/12+42/90 8/12+84/90 8/24+42/90 24/12+42/90 8/36+42/90 40/12+42/90 8/60+42/90 56/12+42/90 8/84+42/90