Subtract 9/21 from 18/36
18/36 - 9/21 is 1/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
18/36 = 18 × 7/36 × 7 = 126/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
9/21 = 9 × 12/21 × 12 = 108/252 - Subtract the two like fractions:
126/252 - 108/252 = 126 - 108/252 = 18/252 - After reducing the fraction, the answer is 1/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/36-18/21 18/72-9/21 18/36-9/42 54/36-9/21 18/36-27/21 18/36-9/63 90/36-9/21 18/36-45/21 18/36-63/21