Add 4/12 and 80/90
4/12 + 80/90 is 11/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
4/12 = 4 × 15/12 × 15 = 60/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
80/90 = 80 × 2/90 × 2 = 160/180 - Add the two like fractions:
60/180 + 160/180 = 60 + 160/180 = 220/180 - 220/180 simplified gives 11/9
- So, 4/12 + 80/90 = 11/9
In mixed form: 12/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/12+80/90 4/24+80/90 4/36+80/90 20/12+80/90 4/60+80/90 28/12+80/90 4/84+80/90