Subtract 5/10 from 9/21
9/21 - 5/10 is -1/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
9/21 = 9 × 10/21 × 10 = 90/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
5/10 = 5 × 21/10 × 21 = 105/210 - Subtract the two like fractions:
90/210 - 105/210 = 90 - 105/210 = -15/210 - After reducing the fraction, the answer is -1/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-5/10 9/42-5/10 9/21-5/20 27/21-5/10 9/21-15/10 9/63-5/10 9/21-5/30 45/21-5/10 9/21-25/10 9/21-5/50 63/21-5/10 9/21-35/10 9/21-5/70