Subtract 90/81 from 64/45
1st number: 1 19/45, 2nd number: 1 9/81
64/45 - 90/81 is 14/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 45 × 9 = 405,
64/45 = 64 × 9/45 × 9 = 576/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
90/81 = 90 × 5/81 × 5 = 450/405 - Subtract the two like fractions:
576/405 - 450/405 = 576 - 450/405 = 126/405 - After reducing the fraction, the answer is 14/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 64/90-90/81