Add 54/84 and 9/12
54/84 + 9/12 is 39/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
54/84 = 54 × 1/84 × 1 = 54/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
9/12 = 9 × 7/12 × 7 = 63/84 - Add the two like fractions:
54/84 + 63/84 = 54 + 63/84 = 117/84 - 117/84 simplified gives 39/28
- So, 54/84 + 9/12 = 39/28
In mixed form: 111/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/84+18/12 54/84+9/24 54/84+27/12 54/84+9/36 54/84+45/12 54/84+9/60 54/84+63/12 54/84+9/84