Subtract 63/90 from 4/81
4/81 - 63/90 is -527/810.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 90 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
4/81 = 4 × 10/81 × 10 = 40/810 - Likewise, for the 2nd fraction, since 90 × 9 = 810,
63/90 = 63 × 9/90 × 9 = 567/810 - Subtract the two like fractions:
40/810 - 567/810 = 40 - 567/810 = -527/810
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/81-63/90 12/81-63/90 20/81-63/90 28/81-63/90