Add 80/72 and 28/42
1st number: 1 8/72, 2nd number: 28/42
80/72 + 28/42 is 16/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 42 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
80/72 = 80 × 7/72 × 7 = 560/504 - Likewise, for the 2nd fraction, since 42 × 12 = 504,
28/42 = 28 × 12/42 × 12 = 336/504 - Add the two like fractions:
560/504 + 336/504 = 560 + 336/504 = 896/504 - 896/504 simplified gives 16/9
- So, 80/72 + 28/42 = 16/9
In mixed form: 17/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/72+56/42 80/72+28/84 80/72+84/42