Subtract 2/5 from 3/18
3/18 - 2/5 is -7/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 5 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
3/18 = 3 × 5/18 × 5 = 15/90 - Likewise, for the 2nd fraction, since 5 × 18 = 90,
2/5 = 2 × 18/5 × 18 = 36/90 - Subtract the two like fractions:
15/90 - 36/90 = 15 - 36/90 = -21/90 - After reducing the fraction, the answer is -7/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/18-2/5 3/18-4/5 3/36-2/5 3/18-2/10 9/18-2/5 3/18-6/5 3/54-2/5 3/18-2/15 15/18-2/5 3/18-10/5 3/90-2/5 3/18-2/25 21/18-2/5 3/18-14/5 3/18-2/35