Subtract 15/81 from 21/75
21/75 - 15/81 is 64/675.
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,
21/75 = 21 × 27/75 × 27 = 567/2025 - Likewise, for the 2nd fraction, since 81 × 25 = 2025,
15/81 = 15 × 25/81 × 25 = 375/2025 - Subtract the two like fractions:
567/2025 - 375/2025 = 567 - 375/2025 = 192/2025 - After reducing the fraction, the answer is 64/675
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75-15/81 21/75-30/81 63/75-15/81 21/75-45/81 21/75-75/81