Subtract 21/10 from 9/18
1st number: 9/18, 2nd number: 2 1/10
9/18 - 21/10 is -8/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
9/18 = 9 × 5/18 × 5 = 45/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
21/10 = 21 × 9/10 × 9 = 189/90 - Subtract the two like fractions:
45/90 - 189/90 = 45 - 189/90 = -144/90 - After reducing the fraction, the answer is -8/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 9/18-42/10 9/36-21/10 9/18-21/20 27/18-21/10 9/18-63/10 9/54-21/10 9/18-21/30 45/18-21/10 9/90-21/10 9/18-21/50 63/18-21/10 9/18-21/70