Subtract 28/80 from 75/90
75/90 - 28/80 is 29/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
75/90 = 75 × 8/90 × 8 = 600/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
28/80 = 28 × 9/80 × 9 = 252/720 - Subtract the two like fractions:
600/720 - 252/720 = 600 - 252/720 = 348/720 - After reducing the fraction, the answer is 29/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/90-56/80 75/90-84/80