Add 21/12 and 25/18
1st number: 1 9/12, 2nd number: 1 7/18
21/12 + 25/18 is 113/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 18 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
21/12 = 21 × 3/12 × 3 = 63/36 - Likewise, for the 2nd fraction, since 18 × 2 = 36,
25/18 = 25 × 2/18 × 2 = 50/36 - Add the two like fractions:
63/36 + 50/36 = 63 + 50/36 = 113/36 - So, 21/12 + 25/18 = 113/36
In mixed form: 35/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+25/18 21/12+50/18 21/24+25/18 21/12+25/36 63/12+25/18 21/12+75/18 21/36+25/18 21/12+25/54 21/60+25/18 21/12+25/90 21/84+25/18