Add 1/21 and 3/81
1/21 + 3/81 is 16/189.
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,
1/21 = 1 × 27/21 × 27 = 27/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
3/81 = 3 × 7/81 × 7 = 21/567 - Add the two like fractions:
27/567 + 21/567 = 27 + 21/567 = 48/567 - 48/567 simplified gives 16/189
- So, 1/21 + 3/81 = 16/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+3/81 1/21+6/81 1/42+3/81 3/21+3/81 1/21+9/81 1/63+3/81 5/21+3/81 1/21+15/81 7/21+3/81 1/21+21/81