Subtract 9/12 from 42/2
1st number: 21 0/2, 2nd number: 9/12
42/2 - 9/12 is 81/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 12 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 2 × 6 = 12,
42/2 = 42 × 6/2 × 6 = 252/12 - Likewise, for the 2nd fraction, since 12 × 1 = 12,
9/12 = 9 × 1/12 × 1 = 9/12 - Subtract the two like fractions:
252/12 - 9/12 = 252 - 9/12 = 243/12 - After reducing the fraction, the answer is 81/4
- In mixed form: 201/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/2-9/12 42/2-18/12 42/4-9/12 42/2-9/24 42/2-27/12 42/6-9/12 42/2-9/36 42/2-45/12 42/10-9/12 42/2-9/60 42/2-63/12 42/14-9/12 42/2-9/84