Subtract 21/9 from 18/4
1st number: 4 2/4, 2nd number: 2 3/9
18/4 - 21/9 is 13/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 9 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 4 × 9 = 36,
18/4 = 18 × 9/4 × 9 = 162/36 - Likewise, for the 2nd fraction, since 9 × 4 = 36,
21/9 = 21 × 4/9 × 4 = 84/36 - Subtract the two like fractions:
162/36 - 84/36 = 162 - 84/36 = 78/36 - After reducing the fraction, the answer is 13/6
- In mixed form: 21/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/4-21/9 18/4-42/9 18/8-21/9 18/4-21/18 54/4-21/9 18/4-63/9 18/12-21/9 18/4-21/27 90/4-21/9 18/20-21/9 18/4-21/45 18/28-21/9 18/4-21/63