Subtract 21/6 from 18/3
1st number: 6 0/3, 2nd number: 3 3/6
18/3 - 21/6 is 5/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 6 is 6
Next, find the equivalent fraction of both fractional numbers with denominator 6 - For the 1st fraction, since 3 × 2 = 6,
18/3 = 18 × 2/3 × 2 = 36/6 - Likewise, for the 2nd fraction, since 6 × 1 = 6,
21/6 = 21 × 1/6 × 1 = 21/6 - Subtract the two like fractions:
36/6 - 21/6 = 36 - 21/6 = 15/6 - After reducing the fraction, the answer is 5/2
- In mixed form: 21/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/3-21/6 18/3-42/6 18/6-21/6 18/3-21/12 54/3-21/6 18/3-63/6 18/9-21/6 18/3-21/18 90/3-21/6 18/15-21/6 18/3-21/30 18/21-21/6 18/3-21/42