Subtract 9/18 from 42/2
1st number: 21 0/2, 2nd number: 9/18
42/2 - 9/18 is 41/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 2 × 9 = 18,
42/2 = 42 × 9/2 × 9 = 378/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
9/18 = 9 × 1/18 × 1 = 9/18 - Subtract the two like fractions:
378/18 - 9/18 = 378 - 9/18 = 369/18 - After reducing the fraction, the answer is 41/2
- In mixed form: 201/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/2-9/18 42/4-9/18 42/2-9/36 42/2-27/18 42/6-9/18 42/2-9/54 42/2-45/18 42/10-9/18 42/2-9/90 42/2-63/18 42/14-9/18