Add 72/9 and 42/20
1st number: 8 0/9, 2nd number: 2 2/20
72/9 + 42/20 is 101/10.
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,
42/20 = 42 × 9/20 × 9 = 378/180 - Add the two like fractions:
1440/180 + 378/180 = 1440 + 378/180 = 1818/180 - 1818/180 simplified gives 101/10
- So, 72/9 + 42/20 = 101/10
In mixed form: 101/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/9+84/20 72/18+42/20 72/9+42/40 72/27+42/20 72/9+42/60 72/45+42/20 72/63+42/20