Add 90/8 and 21/9
1st number: 11 2/8, 2nd number: 2 3/9
90/8 + 21/9 is 163/12.
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,
21/9 = 21 × 8/9 × 8 = 168/72 - Add the two like fractions:
810/72 + 168/72 = 810 + 168/72 = 978/72 - 978/72 simplified gives 163/12
- So, 90/8 + 21/9 = 163/12
In mixed form: 137/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/8+42/9 90/16+21/9 90/8+21/18 90/8+63/9 90/24+21/9 90/8+21/27 90/40+21/9 90/8+21/45 90/56+21/9 90/8+21/63