Subtract 18/4 from 42/10
1st number: 4 2/10, 2nd number: 4 2/4
42/10 - 18/4 is -3/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 4 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 10 × 2 = 20,
42/10 = 42 × 2/10 × 2 = 84/20 - Likewise, for the 2nd fraction, since 4 × 5 = 20,
18/4 = 18 × 5/4 × 5 = 90/20 - Subtract the two like fractions:
84/20 - 90/20 = 84 - 90/20 = -6/20 - After reducing the fraction, the answer is -3/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/10-18/4 42/10-36/4 42/20-18/4 42/10-18/8 42/10-54/4 42/30-18/4 42/10-18/12 42/10-90/4 42/50-18/4 42/10-18/20 42/70-18/4 42/10-18/28