Add 90/12 and 70/9
1st number: 7 6/12, 2nd number: 7 7/9
90/12 + 70/9 is 275/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 9 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
90/12 = 90 × 3/12 × 3 = 270/36 - Likewise, for the 2nd fraction, since 9 × 4 = 36,
70/9 = 70 × 4/9 × 4 = 280/36 - Add the two like fractions:
270/36 + 280/36 = 270 + 280/36 = 550/36 - 550/36 simplified gives 275/18
- So, 90/12 + 70/9 = 275/18
In mixed form: 155/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/24+70/9 90/12+70/18 90/36+70/9 90/12+70/27 90/60+70/9 90/12+70/45 90/84+70/9 90/12+70/63