Add 80/12 and 3/21
1st number: 6 8/12, 2nd number: 3/21
80/12 + 3/21 is 143/21.
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,
80/12 = 80 × 7/12 × 7 = 560/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
3/21 = 3 × 4/21 × 4 = 12/84 - Add the two like fractions:
560/84 + 12/84 = 560 + 12/84 = 572/84 - 572/84 simplified gives 143/21
- So, 80/12 + 3/21 = 143/21
In mixed form: 617/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/12+6/21 80/24+3/21 80/12+3/42 80/12+9/21 80/36+3/21 80/12+3/63 80/12+15/21 80/60+3/21 80/84+3/21