Subtract 6/9 from 18/42
18/42 - 6/9 is -5/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
18/42 = 18 × 3/42 × 3 = 54/126 - Likewise, for the 2nd fraction, since 9 × 14 = 126,
6/9 = 6 × 14/9 × 14 = 84/126 - Subtract the two like fractions:
54/126 - 84/126 = 54 - 84/126 = -30/126 - After reducing the fraction, the answer is -5/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42-6/9 18/42-12/9 18/84-6/9 18/42-6/18 54/42-6/9 18/42-18/9 18/42-6/27 90/42-6/9 18/42-30/9 18/42-6/45 18/42-42/9 18/42-6/63