Subtract 80/90 from 18/25
18/25 - 80/90 is -38/225.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 90 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 25 × 18 = 450,
18/25 = 18 × 18/25 × 18 = 324/450 - Likewise, for the 2nd fraction, since 90 × 5 = 450,
80/90 = 80 × 5/90 × 5 = 400/450 - Subtract the two like fractions:
324/450 - 400/450 = 324 - 400/450 = -76/450 - After reducing the fraction, the answer is -38/225
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/25-80/90 18/50-80/90 54/25-80/90 18/75-80/90 90/25-80/90