Subtract 12/45 from 5/81
5/81 - 12/45 is -83/405.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 45 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
5/81 = 5 × 5/81 × 5 = 25/405 - Likewise, for the 2nd fraction, since 45 × 9 = 405,
12/45 = 12 × 9/45 × 9 = 108/405 - Subtract the two like fractions:
25/405 - 108/405 = 25 - 108/405 = -83/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/81-12/45 5/81-24/45 5/81-12/90 15/81-12/45 5/81-36/45 25/81-12/45 5/81-60/45 35/81-12/45 5/81-84/45