Add 20/12 and 80/7
1st number: 1 8/12, 2nd number: 11 3/7
20/12 + 80/7 is 275/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
20/12 = 20 × 7/12 × 7 = 140/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
80/7 = 80 × 12/7 × 12 = 960/84 - Add the two like fractions:
140/84 + 960/84 = 140 + 960/84 = 1100/84 - 1100/84 simplified gives 275/21
- So, 20/12 + 80/7 = 275/21
In mixed form: 132/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12+80/7 20/24+80/7 20/12+80/14 60/12+80/7 20/36+80/7 20/12+80/21 20/60+80/7 20/12+80/35 20/84+80/7 20/12+80/49