Add 72/84 and 21/72
72/84 + 21/72 is 193/168.
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,
72/84 = 72 × 6/84 × 6 = 432/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Add the two like fractions:
432/504 + 147/504 = 432 + 147/504 = 579/504 - 579/504 simplified gives 193/168
- So, 72/84 + 21/72 = 193/168
In mixed form: 125/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/84+42/72 72/84+63/72