Add 1/12 and 80/21
1st number: 1/12, 2nd number: 3 17/21
1/12 + 80/21 is 109/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
1/12 = 1 × 7/12 × 7 = 7/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
80/21 = 80 × 4/21 × 4 = 320/84 - Add the two like fractions:
7/84 + 320/84 = 7 + 320/84 = 327/84 - 327/84 simplified gives 109/28
- So, 1/12 + 80/21 = 109/28
In mixed form: 325/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/12+80/21 1/24+80/21 1/12+80/42 3/12+80/21 1/36+80/21 1/12+80/63 5/12+80/21 1/60+80/21 7/12+80/21 1/84+80/21