Subtract 42/21 from 9/2
1st number: 4 1/2, 2nd number: 2 0/21
9/2 - 42/21 is 5/2.
Steps for subtracting 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,
9/2 = 9 × 21/2 × 21 = 189/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
42/21 = 42 × 2/21 × 2 = 84/42 - Subtract the two like fractions:
189/42 - 84/42 = 189 - 84/42 = 105/42 - 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: 18/2-42/21 9/2-84/21 9/4-42/21 27/2-42/21 9/6-42/21 9/2-42/63 45/2-42/21 9/10-42/21 63/2-42/21 9/14-42/21