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Simplify 21:45
The simplified ratio of 21:45 is 7:15. Free ratio calculator with GCD breakdown.
7:15
GCD of 21 and 45 is 3. Simplified: 21/3 : 45/3 = 7:15
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 / 40 | 21:40 |
| 21 / 43 | 21:43 |
| 21 / 44 | 21:44 |
| 21 / 46 | 21:46 |
| 21 / 47 | 21:47 |
| 21 / 50 | 21:50 |
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.