Add 80/21 and 20/81
1st number: 3 17/21, 2nd number: 20/81
80/21 + 20/81 is 2300/567.
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,
80/21 = 80 × 27/21 × 27 = 2160/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
20/81 = 20 × 7/81 × 7 = 140/567 - Add the two like fractions:
2160/567 + 140/567 = 2160 + 140/567 = 2300/567 - So, 80/21 + 20/81 = 2300/567
In mixed form: 432/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+40/81 80/42+20/81 80/21+60/81 80/63+20/81