Subtract 1/18 from 21/36
21/36 - 1/18 is 19/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 18 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 36 × 1 = 36,
21/36 = 21 × 1/36 × 1 = 21/36 - Likewise, for the 2nd fraction, since 18 × 2 = 36,
1/18 = 1 × 2/18 × 2 = 2/36 - Subtract the two like fractions:
21/36 - 2/36 = 21 - 2/36 = 19/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36-1/18 21/36-2/18 21/72-1/18 21/36-1/36 63/36-1/18 21/36-3/18 21/36-1/54 21/36-5/18 21/36-1/90 21/36-7/18