Subtract 50/42 from 21/18
1st number: 1 3/18, 2nd number: 1 8/42
21/18 - 50/42 is -1/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 42 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 42 × 3 = 126,
50/42 = 50 × 3/42 × 3 = 150/126 - Subtract the two like fractions:
147/126 - 150/126 = 147 - 150/126 = -3/126 - After reducing the fraction, the answer is -1/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-50/42 21/36-50/42 21/18-50/84 63/18-50/42 21/54-50/42 21/90-50/42