Add 80/21 and 45/81
1st number: 3 17/21, 2nd number: 45/81
80/21 + 45/81 is 275/63.
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,
45/81 = 45 × 7/81 × 7 = 315/567 - Add the two like fractions:
2160/567 + 315/567 = 2160 + 315/567 = 2475/567 - 2475/567 simplified gives 275/63
- So, 80/21 + 45/81 = 275/63
In mixed form: 423/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+90/81 80/42+45/81 80/63+45/81