Subtract 21/7 from 14/18
1st number: 14/18, 2nd number: 3 0/7
14/18 - 21/7 is -20/9.
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,
14/18 = 14 × 7/18 × 7 = 98/126 - Likewise, for the 2nd fraction, since 7 × 18 = 126,
21/7 = 21 × 18/7 × 18 = 378/126 - Subtract the two like fractions:
98/126 - 378/126 = 98 - 378/126 = -280/126 - After reducing the fraction, the answer is -20/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/18-21/7 14/18-42/7 14/36-21/7 14/18-21/14 42/18-21/7 14/18-63/7 14/54-21/7 70/18-21/7 14/90-21/7 14/18-21/35 98/18-21/7 14/18-21/49