Add 81/9 and 9/21
1st number: 9 0/9, 2nd number: 9/21
81/9 + 9/21 is 66/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
81/9 = 81 × 7/9 × 7 = 567/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
9/21 = 9 × 3/21 × 3 = 27/63 - Add the two like fractions:
567/63 + 27/63 = 567 + 27/63 = 594/63 - 594/63 simplified gives 66/7
- So, 81/9 + 9/21 = 66/7
In mixed form: 93/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/9+18/21 81/18+9/21 81/9+9/42 81/9+27/21 81/27+9/21 81/9+9/63 81/9+45/21 81/45+9/21 81/9+63/21 81/63+9/21