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Simplify 21/7
21/7 simplified is 3/1 = 3.0000. Free fraction calculator with GCD and decimal conversion.
3/1 = 3.0000
GCD of 21 and 7 is 7. Simplified: 21/7 / 7/7 = 3/1 = 3.0000
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 / 2 | 21/2 = 10.5000 |
| 21 / 5 | 21/5 = 4.2000 |
| 21 / 6 | 7/2 = 3.5000 |
| 21 / 8 | 21/8 = 2.6250 |
| 21 / 9 | 7/3 = 2.3333 |
| 21 / 12 | 7/4 = 1.7500 |
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.