Add 42/84 and 27/72
42/84 + 27/72 is 7/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 84 × 6 = 504,
42/84 = 42 × 6/84 × 6 = 252/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
27/72 = 27 × 7/72 × 7 = 189/504 - Add the two like fractions:
252/504 + 189/504 = 252 + 189/504 = 441/504 - 441/504 simplified gives 7/8
- So, 42/84 + 27/72 = 7/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+54/72 42/84+81/72