Subtract 6/21 from 12/18
12/18 - 6/21 is 8/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
12/18 = 12 × 7/18 × 7 = 84/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
6/21 = 6 × 6/21 × 6 = 36/126 - Subtract the two like fractions:
84/126 - 36/126 = 84 - 36/126 = 48/126 - After reducing the fraction, the answer is 8/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/18-6/21 12/18-12/21 12/36-6/21 12/18-6/42 36/18-6/21 12/18-18/21 12/54-6/21 12/18-6/63 60/18-6/21 12/18-30/21 12/90-6/21 84/18-6/21 12/18-42/21