Add 21/18 and 18/27
1st number: 1 3/18, 2nd number: 18/27
21/18 + 18/27 is 11/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 27 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 18 × 3 = 54,
21/18 = 21 × 3/18 × 3 = 63/54 - Likewise, for the 2nd fraction, since 27 × 2 = 54,
18/27 = 18 × 2/27 × 2 = 36/54 - Add the two like fractions:
63/54 + 36/54 = 63 + 36/54 = 99/54 - 99/54 simplified gives 11/6
- So, 21/18 + 18/27 = 11/6
In mixed form: 15/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+18/27 21/18+36/27 21/36+18/27 21/18+18/54 63/18+18/27 21/18+54/27 21/54+18/27 21/18+18/81 21/18+90/27 21/90+18/27