Subtract 5/70 from 1/42
1/42 - 5/70 is -1/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
1/42 = 1 × 5/42 × 5 = 5/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
5/70 = 5 × 3/70 × 3 = 15/210 - Subtract the two like fractions:
5/210 - 15/210 = 5 - 15/210 = -10/210 - After reducing the fraction, the answer is -1/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/42-5/70 1/42-10/70 1/84-5/70 3/42-5/70 1/42-15/70 5/42-5/70 1/42-25/70 7/42-5/70 1/42-35/70