Add 18/14 and 9/21
1st number: 1 4/14, 2nd number: 9/21
18/14 + 9/21 is 12/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 14 × 3 = 42,
18/14 = 18 × 3/14 × 3 = 54/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
9/21 = 9 × 2/21 × 2 = 18/42 - Add the two like fractions:
54/42 + 18/42 = 54 + 18/42 = 72/42 - 72/42 simplified gives 12/7
- So, 18/14 + 9/21 = 12/7
In mixed form: 15/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/14+9/21 18/14+18/21 18/28+9/21 18/14+9/42 54/14+9/21 18/14+27/21 18/42+9/21 18/14+9/63 90/14+9/21 18/14+45/21 18/70+9/21 18/14+63/21 18/98+9/21