Add 20/5 and 21/72
1st number: 4 0/5, 2nd number: 21/72
20/5 + 21/72 is 103/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 5 × 72 = 360,
20/5 = 20 × 72/5 × 72 = 1440/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
21/72 = 21 × 5/72 × 5 = 105/360 - Add the two like fractions:
1440/360 + 105/360 = 1440 + 105/360 = 1545/360 - 1545/360 simplified gives 103/24
- So, 20/5 + 21/72 = 103/24
In mixed form: 47/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/5+21/72 20/5+42/72 20/10+21/72 60/5+21/72 20/5+63/72 20/15+21/72 20/25+21/72 20/35+21/72