Add 21/18 and 4/12
1st number: 1 3/18, 2nd number: 4/12
21/18 + 4/12 is 3/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 12 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 18 × 2 = 36,
21/18 = 21 × 2/18 × 2 = 42/36 - Likewise, for the 2nd fraction, since 12 × 3 = 36,
4/12 = 4 × 3/12 × 3 = 12/36 - Add the two like fractions:
42/36 + 12/36 = 42 + 12/36 = 54/36 - 54/36 simplified gives 3/2
- So, 21/18 + 4/12 = 3/2
In mixed form: 11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+4/12 21/18+8/12 21/36+4/12 21/18+4/24 63/18+4/12 21/54+4/12 21/18+4/36 21/18+20/12 21/90+4/12 21/18+4/60 21/18+28/12 21/18+4/84