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Simplify 18/21
18/21 simplified is 6/7 = 0.8571. Free fraction calculator with GCD and decimal conversion.
6/7 = 0.8571
GCD of 18 and 21 is 3. Simplified: 18/3 / 21/3 = 6/7 = 0.8571
How This Was Calculated
Simplification: Divide numerator and denominator by their GCD.
Addition: a/b + c/d = (ad + bc) / bd
Subtraction: a/b - c/d = (ad - bc) / bd
Multiplication: a/b × c/d = ac / bd
Division: a/b ÷ c/d = ad / bc
Quick Reference Table
| Input | Result |
|---|---|
| 18 / 16 | 9/8 = 1.1250 |
| 18 / 19 | 18/19 = 0.9474 |
| 18 / 20 | 9/10 = 0.9000 |
| 18 / 22 | 9/11 = 0.8182 |
| 18 / 23 | 18/23 = 0.7826 |
| 18 / 26 | 9/13 = 0.6923 |
Frequently Asked Questions
What is a fraction?
A fraction represents a part of a whole, written as numerator/denominator.
How do I simplify fractions?
Divide both numerator and denominator by their greatest common divisor.
Can I add fractions with different denominators?
Yes, the calculator handles common denominators automatically.