Subtract 8/63 from 7/42
7/42 - 8/63 is 5/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 63 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
7/42 = 7 × 3/42 × 3 = 21/126 - Likewise, for the 2nd fraction, since 63 × 2 = 126,
8/63 = 8 × 2/63 × 2 = 16/126 - Subtract the two like fractions:
21/126 - 16/126 = 21 - 16/126 = 5/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42-8/63 7/42-16/63 7/84-8/63 21/42-8/63 7/42-24/63 35/42-8/63 7/42-40/63 49/42-8/63 7/42-56/63