Subtract 9/40 from 3/18
3/18 - 9/40 is -7/120.
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,
3/18 = 3 × 20/18 × 20 = 60/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
9/40 = 9 × 9/40 × 9 = 81/360 - Subtract the two like fractions:
60/360 - 81/360 = 60 - 81/360 = -21/360 - After reducing the fraction, the answer is -7/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/18-9/40 3/18-18/40 3/36-9/40 3/18-9/80 9/18-9/40 3/18-27/40 3/54-9/40 15/18-9/40 3/18-45/40 3/90-9/40 21/18-9/40 3/18-63/40