Add 81/7 and 70/9
1st number: 11 4/7, 2nd number: 7 7/9
81/7 + 70/9 is 1219/63.
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,
70/9 = 70 × 7/9 × 7 = 490/63 - Add the two like fractions:
729/63 + 490/63 = 729 + 490/63 = 1219/63 - So, 81/7 + 70/9 = 1219/63
In mixed form: 1922/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/14+70/9 81/7+70/18 81/21+70/9 81/7+70/27 81/35+70/9 81/7+70/45 81/49+70/9 81/7+70/63