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Simplify 420:21
The simplified ratio of 420:21 is 20:1. Free ratio calculator with GCD breakdown.
20:1
GCD of 420 and 21 is 21. Simplified: 420/21 : 21/21 = 20:1
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 |
|---|---|
| 420 / 16 | 105:4 |
| 420 / 19 | 420:19 |
| 420 / 20 | 21:1 |
| 420 / 22 | 210:11 |
| 420 / 23 | 420:23 |
| 420 / 26 | 210:13 |
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.