Subtract 63/80 from 8/90
8/90 - 63/80 is -503/720.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 90 × 8 = 720,
8/90 = 8 × 8/90 × 8 = 64/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
63/80 = 63 × 9/80 × 9 = 567/720 - Subtract the two like fractions:
64/720 - 567/720 = 64 - 567/720 = -503/720
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/90-63/80 24/90-63/80 40/90-63/80 56/90-63/80