Subtract 45/80 from 20/75
20/75 - 45/80 is -71/240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 80 is 1200
Next, find the equivalent fraction of both fractional numbers with denominator 1200 - For the 1st fraction, since 75 × 16 = 1200,
20/75 = 20 × 16/75 × 16 = 320/1200 - Likewise, for the 2nd fraction, since 80 × 15 = 1200,
45/80 = 45 × 15/80 × 15 = 675/1200 - Subtract the two like fractions:
320/1200 - 675/1200 = 320 - 675/1200 = -355/1200 - After reducing the fraction, the answer is -71/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/75-45/80 20/75-90/80 60/75-45/80