Subtract 18/42 from 8/63
8/63 - 18/42 is -19/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 63 × 2 = 126,
8/63 = 8 × 2/63 × 2 = 16/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
18/42 = 18 × 3/42 × 3 = 54/126 - Subtract the two like fractions:
16/126 - 54/126 = 16 - 54/126 = -38/126 - After reducing the fraction, the answer is -19/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/63-18/42 8/63-36/42 8/63-18/84 24/63-18/42 8/63-54/42 40/63-18/42 8/63-90/42 56/63-18/42