Add 80/21 and 14/12
1st number: 3 17/21, 2nd number: 1 2/12
80/21 + 14/12 is 209/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
80/21 = 80 × 4/21 × 4 = 320/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
14/12 = 14 × 7/12 × 7 = 98/84 - Add the two like fractions:
320/84 + 98/84 = 320 + 98/84 = 418/84 - 418/84 simplified gives 209/42
- So, 80/21 + 14/12 = 209/42
In mixed form: 441/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+28/12 80/42+14/12 80/21+14/24 80/21+42/12 80/63+14/12 80/21+14/36 80/21+70/12 80/21+14/60 80/21+98/12 80/21+14/84