Add 18/2 and 3/21
1st number: 9 0/2, 2nd number: 3/21
18/2 + 3/21 is 64/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
18/2 = 18 × 21/2 × 21 = 378/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
3/21 = 3 × 2/21 × 2 = 6/42 - Add the two like fractions:
378/42 + 6/42 = 378 + 6/42 = 384/42 - 384/42 simplified gives 64/7
- So, 18/2 + 3/21 = 64/7
In mixed form: 91/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/2+3/21 18/2+6/21 18/4+3/21 18/2+3/42 54/2+3/21 18/2+9/21 18/6+3/21 18/2+3/63 90/2+3/21 18/2+15/21 18/10+3/21 18/14+3/21