Add 20/21 and 5/72
20/21 + 5/72 is 515/504.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
20/21 = 20 × 24/21 × 24 = 480/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
5/72 = 5 × 7/72 × 7 = 35/504 - Add the two like fractions:
480/504 + 35/504 = 480 + 35/504 = 515/504 - So, 20/21 + 5/72 = 515/504
In mixed form: 111/504
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+5/72 20/21+10/72 20/42+5/72 60/21+5/72 20/21+15/72 20/63+5/72 20/21+25/72 20/21+35/72