Subtract 21/18 from 16/7
1st number: 2 2/7, 2nd number: 1 3/18
16/7 - 21/18 is 47/42.
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,
16/7 = 16 × 18/7 × 18 = 288/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
21/18 = 21 × 7/18 × 7 = 147/126 - Subtract the two like fractions:
288/126 - 147/126 = 288 - 147/126 = 141/126 - After reducing the fraction, the answer is 47/42
- In mixed form: 15/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/7-21/18 16/7-42/18 16/14-21/18 16/7-21/36 48/7-21/18 16/7-63/18 16/21-21/18 16/7-21/54 80/7-21/18 16/35-21/18 16/7-21/90 16/49-21/18