Subtract 9/18 from 6/42
6/42 - 9/18 is -5/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
6/42 = 6 × 3/42 × 3 = 18/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
9/18 = 9 × 7/18 × 7 = 63/126 - Subtract the two like fractions:
18/126 - 63/126 = 18 - 63/126 = -45/126 - After reducing the fraction, the answer is -5/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/42-9/18 6/84-9/18 6/42-9/36 18/42-9/18 6/42-27/18 6/42-9/54 30/42-9/18 6/42-45/18 6/42-9/90 6/42-63/18