Add 54/21 and 12/18
1st number: 2 12/21, 2nd number: 12/18
54/21 + 12/18 is 68/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
54/21 = 54 × 6/21 × 6 = 324/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
12/18 = 12 × 7/18 × 7 = 84/126 - Add the two like fractions:
324/126 + 84/126 = 324 + 84/126 = 408/126 - 408/126 simplified gives 68/21
- So, 54/21 + 12/18 = 68/21
In mixed form: 35/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+24/18 54/42+12/18 54/21+12/36 54/21+36/18 54/63+12/18 54/21+12/54 54/21+60/18 54/21+12/90 54/21+84/18