Subtract 63/42 from 8/18
1st number: 8/18, 2nd number: 1 21/42
8/18 - 63/42 is -19/18.
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,
8/18 = 8 × 7/18 × 7 = 56/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
63/42 = 63 × 3/42 × 3 = 189/126 - Subtract the two like fractions:
56/126 - 189/126 = 56 - 189/126 = -133/126 - After reducing the fraction, the answer is -19/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/18-63/42 8/36-63/42 8/18-63/84 24/18-63/42 8/54-63/42 40/18-63/42 8/90-63/42 56/18-63/42