Add 28/42 and 8/72
28/42 + 8/72 is 7/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 42 × 12 = 504,
28/42 = 28 × 12/42 × 12 = 336/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
8/72 = 8 × 7/72 × 7 = 56/504 - Add the two like fractions:
336/504 + 56/504 = 336 + 56/504 = 392/504 - 392/504 simplified gives 7/9
- So, 28/42 + 8/72 = 7/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42+8/72 28/42+16/72 28/84+8/72 84/42+8/72 28/42+24/72 28/42+40/72 28/42+56/72