Add 8/21 and 3/81
8/21 + 3/81 is 79/189.
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,
3/81 = 3 × 7/81 × 7 = 21/567 - Add the two like fractions:
216/567 + 21/567 = 216 + 21/567 = 237/567 - 237/567 simplified gives 79/189
- So, 8/21 + 3/81 = 79/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+3/81 8/21+6/81 8/42+3/81 24/21+3/81 8/21+9/81 8/63+3/81 40/21+3/81 8/21+15/81 56/21+3/81 8/21+21/81