Subtract 45/54 from 30/80
30/80 - 45/54 is -11/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 54 is 2160
Next, find the equivalent fraction of both fractional numbers with denominator 2160 - For the 1st fraction, since 80 × 27 = 2160,
30/80 = 30 × 27/80 × 27 = 810/2160 - Likewise, for the 2nd fraction, since 54 × 40 = 2160,
45/54 = 45 × 40/54 × 40 = 1800/2160 - Subtract the two like fractions:
810/2160 - 1800/2160 = 810 - 1800/2160 = -990/2160 - After reducing the fraction, the answer is -11/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80-45/54 30/80-90/54 90/80-45/54