Add 70/18 and 21/56
1st number: 3 16/18, 2nd number: 21/56
70/18 + 21/56 is 307/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 56 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 18 × 28 = 504,
70/18 = 70 × 28/18 × 28 = 1960/504 - Likewise, for the 2nd fraction, since 56 × 9 = 504,
21/56 = 21 × 9/56 × 9 = 189/504 - Add the two like fractions:
1960/504 + 189/504 = 1960 + 189/504 = 2149/504 - 2149/504 simplified gives 307/72
- So, 70/18 + 21/56 = 307/72
In mixed form: 419/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/18+42/56 70/36+21/56 70/18+63/56 70/54+21/56 70/90+21/56