Subtract 5/10 from 18/42
18/42 - 5/10 is -1/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
18/42 = 18 × 5/42 × 5 = 90/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
5/10 = 5 × 21/10 × 21 = 105/210 - Subtract the two like fractions:
90/210 - 105/210 = 90 - 105/210 = -15/210 - After reducing the fraction, the answer is -1/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42-5/10 18/84-5/10 18/42-5/20 54/42-5/10 18/42-15/10 18/42-5/30 90/42-5/10 18/42-25/10 18/42-5/50 18/42-35/10 18/42-5/70