Add 6/72 and 21/20
1st number: 6/72, 2nd number: 1 1/20
6/72 + 21/20 is 17/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 20 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
6/72 = 6 × 5/72 × 5 = 30/360 - Likewise, for the 2nd fraction, since 20 × 18 = 360,
21/20 = 21 × 18/20 × 18 = 378/360 - Add the two like fractions:
30/360 + 378/360 = 30 + 378/360 = 408/360 - 408/360 simplified gives 17/15
- So, 6/72 + 21/20 = 17/15
In mixed form: 12/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/72+21/20 6/72+42/20 6/72+21/40 18/72+21/20 6/72+63/20 6/72+21/60 30/72+21/20 42/72+21/20