Subtract 63/8 from 42/10
1st number: 4 2/10, 2nd number: 7 7/8
42/10 - 63/8 is -147/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 10 × 4 = 40,
42/10 = 42 × 4/10 × 4 = 168/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
63/8 = 63 × 5/8 × 5 = 315/40 - Subtract the two like fractions:
168/40 - 315/40 = 168 - 315/40 = -147/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/10-63/8 42/20-63/8 42/10-63/16 42/30-63/8 42/10-63/24 42/50-63/8 42/10-63/40 42/70-63/8 42/10-63/56