Add 80/12 and 20/45
1st number: 6 8/12, 2nd number: 20/45
80/12 + 20/45 is 64/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
80/12 = 80 × 15/12 × 15 = 1200/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
20/45 = 20 × 4/45 × 4 = 80/180 - Add the two like fractions:
1200/180 + 80/180 = 1200 + 80/180 = 1280/180 - 1280/180 simplified gives 64/9
- So, 80/12 + 20/45 = 64/9
In mixed form: 71/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/12+40/45 80/24+20/45 80/12+20/90 80/12+60/45 80/36+20/45 80/60+20/45 80/84+20/45