Subtract 6/21 from 7/18
7/18 - 6/21 is 13/126.
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,
7/18 = 7 × 7/18 × 7 = 49/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
6/21 = 6 × 6/21 × 6 = 36/126 - Subtract the two like fractions:
49/126 - 36/126 = 49 - 36/126 = 13/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18-6/21 7/18-12/21 7/36-6/21 7/18-6/42 21/18-6/21 7/18-18/21 7/54-6/21 7/18-6/63 35/18-6/21 7/18-30/21 7/90-6/21 49/18-6/21 7/18-42/21