Add 18/21 and 12/36
18/21 + 12/36 is 25/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 21 × 12 = 252,
18/21 = 18 × 12/21 × 12 = 216/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
12/36 = 12 × 7/36 × 7 = 84/252 - Add the two like fractions:
216/252 + 84/252 = 216 + 84/252 = 300/252 - 300/252 simplified gives 25/21
- So, 18/21 + 12/36 = 25/21
In mixed form: 14/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+12/36 18/21+24/36 18/42+12/36 18/21+12/72 54/21+12/36 18/63+12/36 90/21+12/36 18/21+60/36 18/21+84/36