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Simplify 21:90
The simplified ratio of 21:90 is 7:30. Free ratio calculator with GCD breakdown.
7:30
GCD of 21 and 90 is 3. Simplified: 21/3 : 90/3 = 7:30
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 / 85 | 21:85 |
| 21 / 88 | 21:88 |
| 21 / 89 | 21:89 |
| 21 / 91 | 3:13 |
| 21 / 92 | 21:92 |
| 21 / 95 | 21:95 |
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.