Add 54/12 and 12/21
1st number: 4 6/12, 2nd number: 12/21
54/12 + 12/21 is 71/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
54/12 = 54 × 7/12 × 7 = 378/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
12/21 = 12 × 4/21 × 4 = 48/84 - Add the two like fractions:
378/84 + 48/84 = 378 + 48/84 = 426/84 - 426/84 simplified gives 71/14
- So, 54/12 + 12/21 = 71/14
In mixed form: 51/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/12+24/21 54/24+12/21 54/12+12/42 54/12+36/21 54/36+12/21 54/12+12/63 54/12+60/21 54/60+12/21 54/12+84/21 54/84+12/21