Add 81/21 and 1/9
1st number: 3 18/21, 2nd number: 1/9
81/21 + 1/9 is 250/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
81/21 = 81 × 3/21 × 3 = 243/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
1/9 = 1 × 7/9 × 7 = 7/63 - Add the two like fractions:
243/63 + 7/63 = 243 + 7/63 = 250/63 - So, 81/21 + 1/9 = 250/63
In mixed form: 361/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21+2/9 81/42+1/9 81/21+1/18 81/21+3/9 81/63+1/9 81/21+1/27 81/21+5/9 81/21+1/45 81/21+7/9 81/21+1/63