Subtract 30/81 from 8/45
8/45 - 30/81 is -26/135.
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,
8/45 = 8 × 9/45 × 9 = 72/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
30/81 = 30 × 5/81 × 5 = 150/405 - Subtract the two like fractions:
72/405 - 150/405 = 72 - 150/405 = -78/405 - After reducing the fraction, the answer is -26/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/45-30/81 8/45-60/81 8/90-30/81 24/45-30/81 8/45-90/81 40/45-30/81 56/45-30/81