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Simplify 21:21
The simplified ratio of 21:21 is 1:1. Free ratio calculator with GCD breakdown.
1:1
GCD of 21 and 21 is 21. Simplified: 21/21 : 21/21 = 1:1
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 / 16 | 21:16 |
| 21 / 19 | 21:19 |
| 21 / 20 | 21:20 |
| 21 / 22 | 21:22 |
| 21 / 23 | 21:23 |
| 21 / 26 | 21:26 |
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.