Subtract 7/21 from 6/18
6/18 - 7/21 is 0/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
6/18 = 6 × 7/18 × 7 = 42/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
7/21 = 7 × 6/21 × 6 = 42/126 - Subtract the two like fractions:
42/126 - 42/126 = 42 - 42/126 = 0/126 - The answer is 0
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/18-7/21 6/18-14/21 6/36-7/21 6/18-7/42 6/54-7/21 6/18-7/63 30/18-7/21 6/18-35/21 6/90-7/21 42/18-7/21 6/18-49/21