Subtract 2/40 from 8/18
8/18 - 2/40 is 71/180.
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,
2/40 = 2 × 9/40 × 9 = 18/360 - Subtract the two like fractions:
160/360 - 18/360 = 160 - 18/360 = 142/360 - After reducing the fraction, the answer is 71/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/18-2/40 8/18-4/40 8/36-2/40 8/18-2/80 24/18-2/40 8/18-6/40 8/54-2/40 40/18-2/40 8/18-10/40 8/90-2/40 56/18-2/40 8/18-14/40