Subtract 18/42 from 1/10
1/10 - 18/42 is -23/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
1/10 = 1 × 21/10 × 21 = 21/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
18/42 = 18 × 5/42 × 5 = 90/210 - Subtract the two like fractions:
21/210 - 90/210 = 21 - 90/210 = -69/210 - After reducing the fraction, the answer is -23/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/10-18/42 1/10-36/42 1/20-18/42 1/10-18/84 3/10-18/42 1/10-54/42 1/30-18/42 5/10-18/42 1/10-90/42 1/50-18/42 7/10-18/42 1/70-18/42