Add 90/12 and 90/7
1st number: 7 6/12, 2nd number: 12 6/7
90/12 + 90/7 is 285/14.
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,
90/7 = 90 × 12/7 × 12 = 1080/84 - Add the two like fractions:
630/84 + 1080/84 = 630 + 1080/84 = 1710/84 - 1710/84 simplified gives 285/14
- So, 90/12 + 90/7 = 285/14
In mixed form: 205/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/24+90/7 90/12+90/14 90/36+90/7 90/12+90/21 90/60+90/7 90/12+90/35 90/84+90/7 90/12+90/49