Subtract 8/10 from 28/80
28/80 - 8/10 is -9/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 10 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
28/80 = 28 × 1/80 × 1 = 28/80 - Likewise, for the 2nd fraction, since 10 × 8 = 80,
8/10 = 8 × 8/10 × 8 = 64/80 - Subtract the two like fractions:
28/80 - 64/80 = 28 - 64/80 = -36/80 - After reducing the fraction, the answer is -9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/80-8/10 28/80-16/10 28/80-8/20 84/80-8/10 28/80-24/10 28/80-8/30 28/80-40/10 28/80-8/50 28/80-56/10 28/80-8/70