Subtract 8/12 from 28/90
28/90 - 8/12 is -16/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
28/90 = 28 × 2/90 × 2 = 56/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
8/12 = 8 × 15/12 × 15 = 120/180 - Subtract the two like fractions:
56/180 - 120/180 = 56 - 120/180 = -64/180 - After reducing the fraction, the answer is -16/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90-8/12 28/90-16/12 28/90-8/24 84/90-8/12 28/90-24/12 28/90-8/36 28/90-40/12 28/90-8/60 28/90-56/12 28/90-8/84