Add 90/12 and 15/7
1st number: 7 6/12, 2nd number: 2 1/7
90/12 + 15/7 is 135/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
90/12 = 90 × 7/12 × 7 = 630/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
15/7 = 15 × 12/7 × 12 = 180/84 - Add the two like fractions:
630/84 + 180/84 = 630 + 180/84 = 810/84 - 810/84 simplified gives 135/14
- So, 90/12 + 15/7 = 135/14
In mixed form: 99/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+30/7 90/24+15/7 90/12+15/14 90/12+45/7 90/36+15/7 90/12+15/21 90/12+75/7 90/60+15/7 90/12+15/35 90/84+15/7 90/12+15/49