Subtract 5/81 from 21/75
21/75 - 5/81 is 442/2025.
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,
5/81 = 5 × 25/81 × 25 = 125/2025 - Subtract the two like fractions:
567/2025 - 125/2025 = 567 - 125/2025 = 442/2025
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75-5/81 21/75-10/81 63/75-5/81 21/75-15/81 21/75-25/81 21/75-35/81