Add 28/72 and 42/80
28/72 + 42/80 is 329/360.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 72 × 10 = 720,
28/72 = 28 × 10/72 × 10 = 280/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
42/80 = 42 × 9/80 × 9 = 378/720 - Add the two like fractions:
280/720 + 378/720 = 280 + 378/720 = 658/720 - 658/720 simplified gives 329/360
- So, 28/72 + 42/80 = 329/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/72+42/80 28/72+84/80 84/72+42/80