Add 18/28 and 20/72
18/28 + 20/72 is 58/63.
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,
20/72 = 20 × 7/72 × 7 = 140/504 - Add the two like fractions:
324/504 + 140/504 = 324 + 140/504 = 464/504 - 464/504 simplified gives 58/63
- So, 18/28 + 20/72 = 58/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28+20/72 18/28+40/72 18/56+20/72 54/28+20/72 18/28+60/72 18/84+20/72 90/28+20/72