Subtract 10/8 from 7/42
1st number: 7/42, 2nd number: 1 2/8
7/42 - 10/8 is -13/12.
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,
7/42 = 7 × 4/42 × 4 = 28/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
10/8 = 10 × 21/8 × 21 = 210/168 - Subtract the two like fractions:
28/168 - 210/168 = 28 - 210/168 = -182/168 - After reducing the fraction, the answer is -13/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42-10/8 7/42-20/8 7/84-10/8 7/42-10/16 21/42-10/8 7/42-30/8 7/42-10/24 35/42-10/8 7/42-50/8 7/42-10/40 49/42-10/8 7/42-70/8 7/42-10/56