Subtract 42/18 from 2/7
1st number: 2/7, 2nd number: 2 6/18
2/7 - 42/18 is -43/21.
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,
42/18 = 42 × 7/18 × 7 = 294/126 - Subtract the two like fractions:
36/126 - 294/126 = 36 - 294/126 = -258/126 - After reducing the fraction, the answer is -43/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/7-42/18 2/7-84/18 2/14-42/18 2/7-42/36 6/7-42/18 2/21-42/18 2/7-42/54 10/7-42/18 2/35-42/18 2/7-42/90 14/7-42/18 2/49-42/18