Subtract 8/18 from 2/7
2/7 - 8/18 is -10/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 7 × 18 = 126,
2/7 = 2 × 18/7 × 18 = 36/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
8/18 = 8 × 7/18 × 7 = 56/126 - Subtract the two like fractions:
36/126 - 56/126 = 36 - 56/126 = -20/126 - After reducing the fraction, the answer is -10/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/7-8/18 2/7-16/18 2/14-8/18 2/7-8/36 6/7-8/18 2/7-24/18 2/21-8/18 2/7-8/54 10/7-8/18 2/7-40/18 2/35-8/18 2/7-8/90 14/7-8/18 2/7-56/18 2/49-8/18