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Simplify 21:66
The simplified ratio of 21:66 is 7:22. Free ratio calculator with GCD breakdown.
7:22
GCD of 21 and 66 is 3. Simplified: 21/3 : 66/3 = 7:22
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 / 61 | 21:61 |
| 21 / 64 | 21:64 |
| 21 / 65 | 21:65 |
| 21 / 67 | 21:67 |
| 21 / 68 | 21:68 |
| 21 / 71 | 21:71 |
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.