Subtract 1/42 from 4/8
4/8 - 1/42 is 10/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
4/8 = 4 × 21/8 × 21 = 84/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
1/42 = 1 × 4/42 × 4 = 4/168 - Subtract the two like fractions:
84/168 - 4/168 = 84 - 4/168 = 80/168 - After reducing the fraction, the answer is 10/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/8-2/42 4/16-1/42 4/8-1/84 12/8-1/42 4/8-3/42 4/24-1/42 20/8-1/42 4/8-5/42 4/40-1/42 28/8-1/42 4/8-7/42 4/56-1/42