Subtract 8/45 from 3/18
3/18 - 8/45 is -1/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
3/18 = 3 × 5/18 × 5 = 15/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
8/45 = 8 × 2/45 × 2 = 16/90 - Subtract the two like fractions:
15/90 - 16/90 = 15 - 16/90 = -1/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/18-8/45 3/18-16/45 3/36-8/45 3/18-8/90 9/18-8/45 3/18-24/45 3/54-8/45 15/18-8/45 3/18-40/45 3/90-8/45 21/18-8/45 3/18-56/45