Subtract 21/84 from 5/2
1st number: 2 1/2, 2nd number: 21/84
5/2 - 21/84 is 9/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 2 × 42 = 84,
5/2 = 5 × 42/2 × 42 = 210/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
21/84 = 21 × 1/84 × 1 = 21/84 - Subtract the two like fractions:
210/84 - 21/84 = 210 - 21/84 = 189/84 - After reducing the fraction, the answer is 9/4
- In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/2-21/84 5/2-42/84 5/4-21/84 15/2-21/84 5/2-63/84 5/6-21/84 25/2-21/84 5/10-21/84 35/2-21/84 5/14-21/84