Subtract 42/18 from 20/10
1st number: 2 0/10, 2nd number: 2 6/18
20/10 - 42/18 is -1/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 10 × 9 = 90,
20/10 = 20 × 9/10 × 9 = 180/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
42/18 = 42 × 5/18 × 5 = 210/90 - Subtract the two like fractions:
180/90 - 210/90 = 180 - 210/90 = -30/90 - After reducing the fraction, the answer is -1/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/10-42/18 20/10-84/18 20/10-42/36 60/10-42/18 20/30-42/18 20/10-42/54 20/50-42/18 20/10-42/90 20/70-42/18