Subtract 15/81 from 42/75
42/75 - 15/81 is 253/675.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 81 is 2025
Next, find the equivalent fraction of both fractional numbers with denominator 2025 - For the 1st fraction, since 75 × 27 = 2025,
42/75 = 42 × 27/75 × 27 = 1134/2025 - Likewise, for the 2nd fraction, since 81 × 25 = 2025,
15/81 = 15 × 25/81 × 25 = 375/2025 - Subtract the two like fractions:
1134/2025 - 375/2025 = 1134 - 375/2025 = 759/2025 - After reducing the fraction, the answer is 253/675
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/75-15/81 42/75-30/81 42/75-45/81 42/75-75/81