Add 18/72 and 45/28
1st number: 18/72, 2nd number: 1 17/28
18/72 + 45/28 is 13/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 28 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
18/72 = 18 × 7/72 × 7 = 126/504 - Likewise, for the 2nd fraction, since 28 × 18 = 504,
45/28 = 45 × 18/28 × 18 = 810/504 - Add the two like fractions:
126/504 + 810/504 = 126 + 810/504 = 936/504 - 936/504 simplified gives 13/7
- So, 18/72 + 45/28 = 13/7
In mixed form: 16/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/72+45/28 18/72+90/28 18/72+45/56 54/72+45/28 18/72+45/84 90/72+45/28