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Simplify 21/42
21/42 simplified is 1/2 = 0.5000. Free fraction calculator with GCD and decimal conversion.
1/2 = 0.5000
GCD of 21 and 42 is 21. Simplified: 21/21 / 42/21 = 1/2 = 0.5000
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 |
|---|---|
| 21 / 37 | 21/37 = 0.5676 |
| 21 / 40 | 21/40 = 0.5250 |
| 21 / 41 | 21/41 = 0.5122 |
| 21 / 43 | 21/43 = 0.4884 |
| 21 / 44 | 21/44 = 0.4773 |
| 21 / 47 | 21/47 = 0.4468 |
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.