Add 90/12 and 81/15
1st number: 7 6/12, 2nd number: 5 6/15
90/12 + 81/15 is 129/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
90/12 = 90 × 5/12 × 5 = 450/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
81/15 = 81 × 4/15 × 4 = 324/60 - Add the two like fractions:
450/60 + 324/60 = 450 + 324/60 = 774/60 - 774/60 simplified gives 129/10
- So, 90/12 + 81/15 = 129/10
In mixed form: 129/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/24+81/15 90/12+81/30 90/36+81/15 90/12+81/45 90/60+81/15 90/12+81/75 90/84+81/15