Add 18/14 and 18/21
1st number: 1 4/14, 2nd number: 18/21
18/14 + 18/21 is 15/7.
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,
18/21 = 18 × 2/21 × 2 = 36/42 - Add the two like fractions:
54/42 + 36/42 = 54 + 36/42 = 90/42 - 90/42 simplified gives 15/7
- So, 18/14 + 18/21 = 15/7
In mixed form: 21/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/14+18/21 18/14+36/21 18/28+18/21 18/14+18/42 54/14+18/21 18/14+54/21 18/42+18/21 18/14+18/63 90/14+18/21 18/14+90/21 18/70+18/21 18/98+18/21