Add 42/84 and 7/72
42/84 + 7/72 is 43/72.
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,
7/72 = 7 × 7/72 × 7 = 49/504 - Add the two like fractions:
252/504 + 49/504 = 252 + 49/504 = 301/504 - 301/504 simplified gives 43/72
- So, 42/84 + 7/72 = 43/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+14/72 42/84+21/72 42/84+35/72 42/84+49/72