Subtract 16/18 from 21/7
1st number: 3 0/7, 2nd number: 16/18
21/7 - 16/18 is 19/9.
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,
16/18 = 16 × 7/18 × 7 = 112/126 - Subtract the two like fractions:
378/126 - 112/126 = 378 - 112/126 = 266/126 - After reducing the fraction, the answer is 19/9
- In mixed form: 21/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7-16/18 21/7-32/18 21/14-16/18 21/7-16/36 63/7-16/18 21/7-48/18 21/7-16/54 21/7-80/18 21/35-16/18 21/7-16/90 21/49-16/18