Add 12/20 and 72/9
1st number: 12/20, 2nd number: 8 0/9
12/20 + 72/9 is 43/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
12/20 = 12 × 9/20 × 9 = 108/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
72/9 = 72 × 20/9 × 20 = 1440/180 - Add the two like fractions:
108/180 + 1440/180 = 108 + 1440/180 = 1548/180 - 1548/180 simplified gives 43/5
- So, 12/20 + 72/9 = 43/5
In mixed form: 83/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/20+72/9 12/40+72/9 12/20+72/18 36/20+72/9 12/60+72/9 12/20+72/27 60/20+72/9 12/20+72/45 84/20+72/9 12/20+72/63