Subtract 21/10 from 18/24
1st number: 18/24, 2nd number: 2 1/10
18/24 - 21/10 is -27/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 10 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 24 × 5 = 120,
18/24 = 18 × 5/24 × 5 = 90/120 - Likewise, for the 2nd fraction, since 10 × 12 = 120,
21/10 = 21 × 12/10 × 12 = 252/120 - Subtract the two like fractions:
90/120 - 252/120 = 90 - 252/120 = -162/120 - After reducing the fraction, the answer is -27/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/24-21/10 18/24-42/10 18/48-21/10 18/24-21/20 54/24-21/10 18/24-63/10 18/72-21/10 18/24-21/30 90/24-21/10 18/24-21/50 18/24-21/70