Subtract 42/12 from 28/18
1st number: 1 10/18, 2nd number: 3 6/12
28/18 - 42/12 is -35/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 12 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 18 × 2 = 36,
28/18 = 28 × 2/18 × 2 = 56/36 - Likewise, for the 2nd fraction, since 12 × 3 = 36,
42/12 = 42 × 3/12 × 3 = 126/36 - Subtract the two like fractions:
56/36 - 126/36 = 56 - 126/36 = -70/36 - After reducing the fraction, the answer is -35/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/18-42/12 28/18-84/12 28/36-42/12 28/18-42/24 84/18-42/12 28/54-42/12 28/18-42/36 28/90-42/12 28/18-42/60 28/18-42/84