Subtract 56/21 from 16/18
1st number: 16/18, 2nd number: 2 14/21
16/18 - 56/21 is -16/9.
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,
16/18 = 16 × 7/18 × 7 = 112/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
56/21 = 56 × 6/21 × 6 = 336/126 - Subtract the two like fractions:
112/126 - 336/126 = 112 - 336/126 = -224/126 - After reducing the fraction, the answer is -16/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/18-56/21 16/36-56/21 16/18-56/42 48/18-56/21 16/54-56/21 16/18-56/63 80/18-56/21 16/90-56/21