Subtract 4/8 from 10/42
10/42 - 4/8 is -11/42.
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,
10/42 = 10 × 4/42 × 4 = 40/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
4/8 = 4 × 21/8 × 21 = 84/168 - Subtract the two like fractions:
40/168 - 84/168 = 40 - 84/168 = -44/168 - After reducing the fraction, the answer is -11/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42-4/8 10/84-4/8 10/42-4/16 30/42-4/8 10/42-12/8 10/42-4/24 50/42-4/8 10/42-20/8 10/42-4/40 70/42-4/8 10/42-28/8 10/42-4/56