Subtract 10/18 from 6/21
6/21 - 10/18 is -17/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
6/21 = 6 × 6/21 × 6 = 36/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
10/18 = 10 × 7/18 × 7 = 70/126 - Subtract the two like fractions:
36/126 - 70/126 = 36 - 70/126 = -34/126 - After reducing the fraction, the answer is -17/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21-10/18 6/21-20/18 6/42-10/18 6/21-10/36 18/21-10/18 6/21-30/18 6/63-10/18 6/21-10/54 30/21-10/18 6/21-50/18 6/21-10/90 42/21-10/18 6/21-70/18