Subtract 42/7 from 7/18
1st number: 7/18, 2nd number: 6 0/7
7/18 - 42/7 is -101/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 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 7 × 18 = 126,
42/7 = 42 × 18/7 × 18 = 756/126 - Subtract the two like fractions:
49/126 - 756/126 = 49 - 756/126 = -707/126 - After reducing the fraction, the answer is -101/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18-42/7 7/18-84/7 7/36-42/7 7/18-42/14 21/18-42/7 7/54-42/7 7/18-42/21 35/18-42/7 7/90-42/7 7/18-42/35 49/18-42/7 7/18-42/49