Subtract 12/9 from 28/80
1st number: 28/80, 2nd number: 1 3/9
28/80 - 12/9 is -59/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 9 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
28/80 = 28 × 9/80 × 9 = 252/720 - Likewise, for the 2nd fraction, since 9 × 80 = 720,
12/9 = 12 × 80/9 × 80 = 960/720 - Subtract the two like fractions:
252/720 - 960/720 = 252 - 960/720 = -708/720 - After reducing the fraction, the answer is -59/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/80-12/9 28/80-24/9 28/80-12/18 84/80-12/9 28/80-36/9 28/80-12/27 28/80-60/9 28/80-12/45 28/80-84/9 28/80-12/63