Subtract 6/18 from 21/7
1st number: 3 0/7, 2nd number: 6/18
21/7 - 6/18 is 8/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 7 × 18 = 126,
21/7 = 21 × 18/7 × 18 = 378/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
6/18 = 6 × 7/18 × 7 = 42/126 - Subtract the two like fractions:
378/126 - 42/126 = 378 - 42/126 = 336/126 - After reducing the fraction, the answer is 8/3
- In mixed form: 22/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7-6/18 21/7-12/18 21/14-6/18 21/7-6/36 63/7-6/18 21/7-6/54 21/7-30/18 21/35-6/18 21/7-6/90 21/7-42/18 21/49-6/18