Subtract 90/80 from 5/45
1st number: 5/45, 2nd number: 1 10/80
5/45 - 90/80 is -73/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 45 × 16 = 720,
5/45 = 5 × 16/45 × 16 = 80/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
90/80 = 90 × 9/80 × 9 = 810/720 - Subtract the two like fractions:
80/720 - 810/720 = 80 - 810/720 = -730/720 - After reducing the fraction, the answer is -73/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/45-90/80 5/90-90/80 15/45-90/80 25/45-90/80 35/45-90/80