Subtract 3/4 from 90/81
1st number: 1 9/81, 2nd number: 3/4
90/81 - 3/4 is 13/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 4 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
90/81 = 90 × 4/81 × 4 = 360/324 - Likewise, for the 2nd fraction, since 4 × 81 = 324,
3/4 = 3 × 81/4 × 81 = 243/324 - Subtract the two like fractions:
360/324 - 243/324 = 360 - 243/324 = 117/324 - After reducing the fraction, the answer is 13/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/81-6/4 90/81-3/8 90/81-9/4 90/81-3/12 90/81-15/4 90/81-3/20 90/81-21/4 90/81-3/28