Subtract 21/36 from 2/18
2/18 - 21/36 is -17/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 36 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 18 × 2 = 36,
2/18 = 2 × 2/18 × 2 = 4/36 - Likewise, for the 2nd fraction, since 36 × 1 = 36,
21/36 = 21 × 1/36 × 1 = 21/36 - Subtract the two like fractions:
4/36 - 21/36 = 4 - 21/36 = -17/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/18-21/36 2/18-42/36 2/36-21/36 2/18-21/72 6/18-21/36 2/18-63/36 2/54-21/36 10/18-21/36 2/90-21/36 14/18-21/36