Add 72/20 and 18/9
1st number: 3 12/20, 2nd number: 2 0/9
72/20 + 18/9 is 28/5.
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,
72/20 = 72 × 9/20 × 9 = 648/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
18/9 = 18 × 20/9 × 20 = 360/180 - Add the two like fractions:
648/180 + 360/180 = 648 + 360/180 = 1008/180 - 1008/180 simplified gives 28/5
- So, 72/20 + 18/9 = 28/5
In mixed form: 53/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20+36/9 72/40+18/9 72/20+54/9 72/60+18/9 72/20+18/27 72/20+90/9 72/20+18/45 72/20+18/63