Add 72/9 and 15/20
1st number: 8 0/9, 2nd number: 15/20
72/9 + 15/20 is 35/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
72/9 = 72 × 20/9 × 20 = 1440/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
15/20 = 15 × 9/20 × 9 = 135/180 - Add the two like fractions:
1440/180 + 135/180 = 1440 + 135/180 = 1575/180 - 1575/180 simplified gives 35/4
- So, 72/9 + 15/20 = 35/4
In mixed form: 83/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/9+30/20 72/18+15/20 72/9+15/40 72/9+45/20 72/27+15/20 72/9+15/60 72/9+75/20 72/45+15/20 72/63+15/20