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Simplify 15/21
15/21 simplified is 5/7 = 0.7143. Free fraction calculator with GCD and decimal conversion.
5/7 = 0.7143
GCD of 15 and 21 is 3. Simplified: 15/3 / 21/3 = 5/7 = 0.7143
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 |
|---|---|
| 15 / 16 | 15/16 = 0.9375 |
| 15 / 19 | 15/19 = 0.7895 |
| 15 / 20 | 3/4 = 0.7500 |
| 15 / 22 | 15/22 = 0.6818 |
| 15 / 23 | 15/23 = 0.6522 |
| 15 / 26 | 15/26 = 0.5769 |
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.