Subtract 63/8 from 8/42
1st number: 8/42, 2nd number: 7 7/8
8/42 - 63/8 is -1291/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
8/42 = 8 × 4/42 × 4 = 32/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
63/8 = 63 × 21/8 × 21 = 1323/168 - Subtract the two like fractions:
32/168 - 1323/168 = 32 - 1323/168 = -1291/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/42-63/8 8/84-63/8 8/42-63/16 24/42-63/8 8/42-63/24 40/42-63/8 8/42-63/40 56/42-63/8 8/42-63/56