Subtract 42/18 from 12/90
1st number: 12/90, 2nd number: 2 6/18
12/90 - 42/18 is -11/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
12/90 = 12 × 1/90 × 1 = 12/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
42/18 = 42 × 5/18 × 5 = 210/90 - Subtract the two like fractions:
12/90 - 210/90 = 12 - 210/90 = -198/90 - After reducing the fraction, the answer is -11/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90-42/18 12/90-84/18 12/90-42/36 36/90-42/18 12/90-42/54 60/90-42/18 12/90-42/90 84/90-42/18