Subtract 32/40 from 8/18
8/18 - 32/40 is -16/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
8/18 = 8 × 20/18 × 20 = 160/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
32/40 = 32 × 9/40 × 9 = 288/360 - Subtract the two like fractions:
160/360 - 288/360 = 160 - 288/360 = -128/360 - After reducing the fraction, the answer is -16/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/18-32/40 8/18-64/40 8/36-32/40 8/18-32/80 24/18-32/40 8/18-96/40 8/54-32/40 40/18-32/40 8/90-32/40 56/18-32/40