Subtract 75/81 from 1/90
1/90 - 75/81 is -247/270.
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,
1/90 = 1 × 9/90 × 9 = 9/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
75/81 = 75 × 10/81 × 10 = 750/810 - Subtract the two like fractions:
9/810 - 750/810 = 9 - 750/810 = -741/810 - After reducing the fraction, the answer is -247/270
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/90-75/81 3/90-75/81 5/90-75/81 7/90-75/81