Add 72/20 and 21/6
1st number: 3 12/20, 2nd number: 3 3/6
72/20 + 21/6 is 71/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 6 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
72/20 = 72 × 3/20 × 3 = 216/60 - Likewise, for the 2nd fraction, since 6 × 10 = 60,
21/6 = 21 × 10/6 × 10 = 210/60 - Add the two like fractions:
216/60 + 210/60 = 216 + 210/60 = 426/60 - 426/60 simplified gives 71/10
- So, 72/20 + 21/6 = 71/10
In mixed form: 71/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20+42/6 72/40+21/6 72/20+21/12 72/20+63/6 72/60+21/6 72/20+21/18 72/20+21/30 72/20+21/42