Subtract 18/45 from 10/80
10/80 - 18/45 is -11/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 45 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
10/80 = 10 × 9/80 × 9 = 90/720 - Likewise, for the 2nd fraction, since 45 × 16 = 720,
18/45 = 18 × 16/45 × 16 = 288/720 - Subtract the two like fractions:
90/720 - 288/720 = 90 - 288/720 = -198/720 - After reducing the fraction, the answer is -11/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/80-18/45 10/80-36/45 10/80-18/90 30/80-18/45 10/80-54/45 50/80-18/45 10/80-90/45 70/80-18/45