Add 18/28 and 84/72
1st number: 18/28, 2nd number: 1 12/72
18/28 + 84/72 is 38/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 28 × 18 = 504,
18/28 = 18 × 18/28 × 18 = 324/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
84/72 = 84 × 7/72 × 7 = 588/504 - Add the two like fractions:
324/504 + 588/504 = 324 + 588/504 = 912/504 - 912/504 simplified gives 38/21
- So, 18/28 + 84/72 = 38/21
In mixed form: 117/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28+84/72 18/56+84/72 54/28+84/72 18/84+84/72 90/28+84/72