Subtract 8/18 from 7/40
7/40 - 8/18 is -97/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 18 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
7/40 = 7 × 9/40 × 9 = 63/360 - Likewise, for the 2nd fraction, since 18 × 20 = 360,
8/18 = 8 × 20/18 × 20 = 160/360 - Subtract the two like fractions:
63/360 - 160/360 = 63 - 160/360 = -97/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/40-8/18 7/40-16/18 7/80-8/18 7/40-8/36 21/40-8/18 7/40-24/18 7/40-8/54 35/40-8/18 7/40-40/18 7/40-8/90 49/40-8/18 7/40-56/18