Subtract 3/7 from 7/18
7/18 - 3/7 is -5/126.
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,
3/7 = 3 × 18/7 × 18 = 54/126 - Subtract the two like fractions:
49/126 - 54/126 = 49 - 54/126 = -5/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18-3/7 7/18-6/7 7/36-3/7 7/18-3/14 21/18-3/7 7/18-9/7 7/54-3/7 7/18-3/21 35/18-3/7 7/18-15/7 7/90-3/7 7/18-3/35 49/18-3/7 7/18-21/7 7/18-3/49