Subtract 7/18 from 28/80
28/80 - 7/18 is -7/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 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 18 × 40 = 720,
7/18 = 7 × 40/18 × 40 = 280/720 - Subtract the two like fractions:
252/720 - 280/720 = 252 - 280/720 = -28/720 - After reducing the fraction, the answer is -7/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/80-7/18 28/80-14/18 28/80-7/36 84/80-7/18 28/80-21/18 28/80-7/54 28/80-35/18 28/80-7/90 28/80-49/18