Add 90/8 and 70/9
1st number: 11 2/8, 2nd number: 7 7/9
90/8 + 70/9 is 685/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 9 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
90/8 = 90 × 9/8 × 9 = 810/72 - Likewise, for the 2nd fraction, since 9 × 8 = 72,
70/9 = 70 × 8/9 × 8 = 560/72 - Add the two like fractions:
810/72 + 560/72 = 810 + 560/72 = 1370/72 - 1370/72 simplified gives 685/36
- So, 90/8 + 70/9 = 685/36
In mixed form: 191/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/16+70/9 90/8+70/18 90/24+70/9 90/8+70/27 90/40+70/9 90/8+70/45 90/56+70/9 90/8+70/63