Subtract 8/81 from 63/90
63/90 - 8/81 is 487/810.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 90 × 9 = 810,
63/90 = 63 × 9/90 × 9 = 567/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
8/81 = 8 × 10/81 × 10 = 80/810 - Subtract the two like fractions:
567/810 - 80/810 = 567 - 80/810 = 487/810
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/90-16/81 63/90-24/81 63/90-40/81 63/90-56/81