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Simplify 21:81
The simplified ratio of 21:81 is 7:27. Free ratio calculator with GCD breakdown.
7:27
GCD of 21 and 81 is 3. Simplified: 21/3 : 81/3 = 7:27
How This Was Calculated
Simplification: Divide both terms by their GCD.A:B = (A/GCD) : (B/GCD)
Solving proportions: A/B = C/D — cross-multiply to find the missing value.
Scaling: Multiply both terms by the scale factor.
Quick Reference Table
| Input | Result |
|---|---|
| 21 / 76 | 21:76 |
| 21 / 79 | 21:79 |
| 21 / 80 | 21:80 |
| 21 / 82 | 21:82 |
| 21 / 83 | 21:83 |
| 21 / 86 | 21:86 |
Frequently Asked Questions
What is a ratio?
A ratio compares two quantities by division.
How do I simplify a ratio?
Divide both numbers by their greatest common divisor (GCD).
Can ratios have decimal values?
Yes, but simplified ratios are typically expressed as whole numbers.