⚡
Simplify 21:28
The simplified ratio of 21:28 is 3:4. Free ratio calculator with GCD breakdown.
3:4
GCD of 21 and 28 is 7. Simplified: 21/7 : 28/7 = 3:4
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 / 23 | 21:23 |
| 21 / 26 | 21:26 |
| 21 / 27 | 7:9 |
| 21 / 29 | 21:29 |
| 21 / 30 | 7:10 |
| 21 / 33 | 7:11 |
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.