Add 7/72 and 30/21
1st number: 7/72, 2nd number: 1 9/21
7/72 + 30/21 is 769/504.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 21 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
7/72 = 7 × 7/72 × 7 = 49/504 - Likewise, for the 2nd fraction, since 21 × 24 = 504,
30/21 = 30 × 24/21 × 24 = 720/504 - Add the two like fractions:
49/504 + 720/504 = 49 + 720/504 = 769/504 - So, 7/72 + 30/21 = 769/504
In mixed form: 1265/504
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/72+30/21 7/72+60/21 7/72+30/42 21/72+30/21 7/72+90/21 7/72+30/63 35/72+30/21 49/72+30/21