Subtract 15/21 from 21/2
1st number: 10 1/2, 2nd number: 15/21
21/2 - 15/21 is 137/14.
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,
21/2 = 21 × 21/2 × 21 = 441/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
15/21 = 15 × 2/21 × 2 = 30/42 - Subtract the two like fractions:
441/42 - 30/42 = 441 - 30/42 = 411/42 - After reducing the fraction, the answer is 137/14
- In mixed form: 911/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2-15/21 21/2-30/21 21/4-15/21 21/2-15/42 63/2-15/21 21/2-45/21 21/6-15/21 21/2-15/63 21/2-75/21 21/10-15/21 21/14-15/21