Subtract 42/5 from 15/18
1st number: 15/18, 2nd number: 8 2/5
15/18 - 42/5 is -227/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 5 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
15/18 = 15 × 5/18 × 5 = 75/90 - Likewise, for the 2nd fraction, since 5 × 18 = 90,
42/5 = 42 × 18/5 × 18 = 756/90 - Subtract the two like fractions:
75/90 - 756/90 = 75 - 756/90 = -681/90 - After reducing the fraction, the answer is -227/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18-42/5 15/18-84/5 15/36-42/5 15/18-42/10 45/18-42/5 15/54-42/5 15/18-42/15 75/18-42/5 15/90-42/5 15/18-42/25 15/18-42/35