Subtract 50/21 from 21/18
1st number: 1 3/18, 2nd number: 2 8/21
21/18 - 50/21 is -17/14.
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,
21/18 = 21 × 7/18 × 7 = 147/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
50/21 = 50 × 6/21 × 6 = 300/126 - Subtract the two like fractions:
147/126 - 300/126 = 147 - 300/126 = -153/126 - After reducing the fraction, the answer is -17/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-50/21 21/36-50/21 21/18-50/42 63/18-50/21 21/54-50/21 21/18-50/63 21/90-50/21