Subtract 21/18 from 7/14
1st number: 7/14, 2nd number: 1 3/18
7/14 - 21/18 is -2/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 14 × 9 = 126,
7/14 = 7 × 9/14 × 9 = 63/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
21/18 = 21 × 7/18 × 7 = 147/126 - Subtract the two like fractions:
63/126 - 147/126 = 63 - 147/126 = -84/126 - After reducing the fraction, the answer is -2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 7/14-42/18 7/28-21/18 7/14-21/36 21/14-21/18 7/14-63/18 7/42-21/18 7/14-21/54 35/14-21/18 7/70-21/18 7/14-21/90 49/14-21/18 7/98-21/18