Add 56/21 and 15/81
1st number: 2 14/21, 2nd number: 15/81
56/21 + 15/81 is 77/27.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,
56/21 = 56 × 27/21 × 27 = 1512/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
15/81 = 15 × 7/81 × 7 = 105/567 - Add the two like fractions:
1512/567 + 105/567 = 1512 + 105/567 = 1617/567 - 1617/567 simplified gives 77/27
- So, 56/21 + 15/81 = 77/27
In mixed form: 223/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+30/81 56/42+15/81 56/21+45/81 56/63+15/81 56/21+75/81