Add 70/21 and 15/72
1st number: 3 7/21, 2nd number: 15/72
70/21 + 15/72 is 85/24.
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,
70/21 = 70 × 24/21 × 24 = 1680/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
15/72 = 15 × 7/72 × 7 = 105/504 - Add the two like fractions:
1680/504 + 105/504 = 1680 + 105/504 = 1785/504 - 1785/504 simplified gives 85/24
- So, 70/21 + 15/72 = 85/24
In mixed form: 313/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+30/72 70/42+15/72 70/21+45/72 70/63+15/72 70/21+75/72