Add 72/18 and 21/60
1st number: 4 0/18, 2nd number: 21/60
72/18 + 21/60 is 87/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 60 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 18 × 10 = 180,
72/18 = 72 × 10/18 × 10 = 720/180 - Likewise, for the 2nd fraction, since 60 × 3 = 180,
21/60 = 21 × 3/60 × 3 = 63/180 - Add the two like fractions:
720/180 + 63/180 = 720 + 63/180 = 783/180 - 783/180 simplified gives 87/20
- So, 72/18 + 21/60 = 87/20
In mixed form: 47/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/18+42/60 72/36+21/60 72/18+63/60 72/54+21/60 72/90+21/60