Subtract 6/8 from 3/42
3/42 - 6/8 is -19/28.
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,
3/42 = 3 × 4/42 × 4 = 12/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
6/8 = 6 × 21/8 × 21 = 126/168 - Subtract the two like fractions:
12/168 - 126/168 = 12 - 126/168 = -114/168 - After reducing the fraction, the answer is -19/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42-6/8 3/42-12/8 3/84-6/8 3/42-6/16 9/42-6/8 3/42-18/8 3/42-6/24 15/42-6/8 3/42-30/8 3/42-6/40 21/42-6/8 3/42-42/8 3/42-6/56