Subtract 5/8 from 18/45
18/45 - 5/8 is -9/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 45 × 8 = 360,
18/45 = 18 × 8/45 × 8 = 144/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
5/8 = 5 × 45/8 × 45 = 225/360 - Subtract the two like fractions:
144/360 - 225/360 = 144 - 225/360 = -81/360 - After reducing the fraction, the answer is -9/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/45-5/8 18/45-10/8 18/90-5/8 18/45-5/16 54/45-5/8 18/45-15/8 18/45-5/24 90/45-5/8 18/45-25/8 18/45-5/40 18/45-35/8 18/45-5/56