Subtract 10/21 from 6/18
6/18 - 10/21 is -1/7.
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,
10/21 = 10 × 6/21 × 6 = 60/126 - Subtract the two like fractions:
42/126 - 60/126 = 42 - 60/126 = -18/126 - After reducing the fraction, the answer is -1/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/18-10/21 6/18-20/21 6/36-10/21 6/18-10/42 6/18-30/21 6/54-10/21 6/18-10/63 30/18-10/21 6/18-50/21 6/90-10/21 42/18-10/21 6/18-70/21