Subtract 4/81 from 75/84
75/84 - 4/81 is 1913/2268.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 81 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 84 × 27 = 2268,
75/84 = 75 × 27/84 × 27 = 2025/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
4/81 = 4 × 28/81 × 28 = 112/2268 - Subtract the two like fractions:
2025/2268 - 112/2268 = 2025 - 112/2268 = 1913/2268
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/84-8/81 75/84-12/81 75/84-20/81 75/84-28/81