Add 54/84 and 12/72
54/84 + 12/72 is 17/21.
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,
54/84 = 54 × 6/84 × 6 = 324/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
12/72 = 12 × 7/72 × 7 = 84/504 - Add the two like fractions:
324/504 + 84/504 = 324 + 84/504 = 408/504 - 408/504 simplified gives 17/21
- So, 54/84 + 12/72 = 17/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/84+24/72 54/84+36/72 54/84+60/72 54/84+84/72