Add 81/7 and 30/9
1st number: 11 4/7, 2nd number: 3 3/9
81/7 + 30/9 is 313/21.
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,
81/7 = 81 × 9/7 × 9 = 729/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
30/9 = 30 × 7/9 × 7 = 210/63 - Add the two like fractions:
729/63 + 210/63 = 729 + 210/63 = 939/63 - 939/63 simplified gives 313/21
- So, 81/7 + 30/9 = 313/21
In mixed form: 1419/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/7+60/9 81/14+30/9 81/7+30/18 81/7+90/9 81/21+30/9 81/7+30/27 81/35+30/9 81/7+30/45 81/49+30/9 81/7+30/63