Subtract 28/80 from 12/45
12/45 - 28/80 is -1/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 45 × 16 = 720,
12/45 = 12 × 16/45 × 16 = 192/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
28/80 = 28 × 9/80 × 9 = 252/720 - Subtract the two like fractions:
192/720 - 252/720 = 192 - 252/720 = -60/720 - After reducing the fraction, the answer is -1/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/45-28/80 12/45-56/80 12/90-28/80 36/45-28/80 12/45-84/80 60/45-28/80 84/45-28/80