Subtract 42/18 from 4/5
1st number: 4/5, 2nd number: 2 6/18
4/5 - 42/18 is -23/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
4/5 = 4 × 18/5 × 18 = 72/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
42/18 = 42 × 5/18 × 5 = 210/90 - Subtract the two like fractions:
72/90 - 210/90 = 72 - 210/90 = -138/90 - After reducing the fraction, the answer is -23/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/5-42/18 4/5-84/18 4/10-42/18 4/5-42/36 12/5-42/18 4/15-42/18 4/5-42/54 20/5-42/18 4/25-42/18 4/5-42/90 28/5-42/18 4/35-42/18