Add 8/21 and 54/81
8/21 + 54/81 is 22/21.
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,
8/21 = 8 × 27/21 × 27 = 216/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
54/81 = 54 × 7/81 × 7 = 378/567 - Add the two like fractions:
216/567 + 378/567 = 216 + 378/567 = 594/567 - 594/567 simplified gives 22/21
- So, 8/21 + 54/81 = 22/21
In mixed form: 11/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+54/81 8/42+54/81 24/21+54/81 8/63+54/81 40/21+54/81 56/21+54/81