Add 18/7 and 12/9
1st number: 2 4/7, 2nd number: 1 3/9
18/7 + 12/9 is 82/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
18/7 = 18 × 9/7 × 9 = 162/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
12/9 = 12 × 7/9 × 7 = 84/63 - Add the two like fractions:
162/63 + 84/63 = 162 + 84/63 = 246/63 - 246/63 simplified gives 82/21
- So, 18/7 + 12/9 = 82/21
In mixed form: 319/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/7+12/9 18/7+24/9 18/14+12/9 18/7+12/18 54/7+12/9 18/7+36/9 18/21+12/9 18/7+12/27 90/7+12/9 18/7+60/9 18/35+12/9 18/7+12/45 18/7+84/9 18/49+12/9 18/7+12/63