Add 15/28 and 20/72
15/28 + 20/72 is 205/252.
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,
15/28 = 15 × 18/28 × 18 = 270/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
20/72 = 20 × 7/72 × 7 = 140/504 - Add the two like fractions:
270/504 + 140/504 = 270 + 140/504 = 410/504 - 410/504 simplified gives 205/252
- So, 15/28 + 20/72 = 205/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28+20/72 15/28+40/72 15/56+20/72 45/28+20/72 15/28+60/72 15/84+20/72 75/28+20/72