Subtract 90/5 from 42/18
1st number: 2 6/18, 2nd number: 18 0/5
42/18 - 90/5 is -47/3.
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,
42/18 = 42 × 5/18 × 5 = 210/90 - Likewise, for the 2nd fraction, since 5 × 18 = 90,
90/5 = 90 × 18/5 × 18 = 1620/90 - Subtract the two like fractions:
210/90 - 1620/90 = 210 - 1620/90 = -1410/90 - After reducing the fraction, the answer is -47/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/18-90/5 42/36-90/5 42/18-90/10 42/54-90/5 42/18-90/15 42/90-90/5 42/18-90/25 42/18-90/35