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Simplify 21:54
The simplified ratio of 21:54 is 7:18. Free ratio calculator with GCD breakdown.
7:18
GCD of 21 and 54 is 3. Simplified: 21/3 : 54/3 = 7:18
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 / 49 | 3:7 |
| 21 / 52 | 21:52 |
| 21 / 53 | 21:53 |
| 21 / 55 | 21:55 |
| 21 / 56 | 3:8 |
| 21 / 59 | 21:59 |
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.