Subtract 25/42 from 4/18
4/18 - 25/42 is -47/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
4/18 = 4 × 7/18 × 7 = 28/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
25/42 = 25 × 3/42 × 3 = 75/126 - Subtract the two like fractions:
28/126 - 75/126 = 28 - 75/126 = -47/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/18-25/42 4/18-50/42 4/36-25/42 4/18-25/84 12/18-25/42 4/18-75/42 4/54-25/42 20/18-25/42 4/90-25/42 28/18-25/42