Subtract 80/90 from 45/50
45/50 - 80/90 is 1/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 90 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 50 × 9 = 450,
45/50 = 45 × 9/50 × 9 = 405/450 - Likewise, for the 2nd fraction, since 90 × 5 = 450,
80/90 = 80 × 5/90 × 5 = 400/450 - Subtract the two like fractions:
405/450 - 400/450 = 405 - 400/450 = 5/450 - After reducing the fraction, the answer is 1/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/50-80/90