Subtract 21/14 from 20/18
1st number: 1 2/18, 2nd number: 1 7/14
20/18 - 21/14 is -7/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 14 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
20/18 = 20 × 7/18 × 7 = 140/126 - Likewise, for the 2nd fraction, since 14 × 9 = 126,
21/14 = 21 × 9/14 × 9 = 189/126 - Subtract the two like fractions:
140/126 - 189/126 = 140 - 189/126 = -49/126 - After reducing the fraction, the answer is -7/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/18-21/14 20/18-42/14 20/36-21/14 20/18-21/28 60/18-21/14 20/18-63/14 20/54-21/14 20/18-21/42 20/90-21/14 20/18-21/70 20/18-21/98