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Simplify 21:72
The simplified ratio of 21:72 is 7:24. Free ratio calculator with GCD breakdown.
7:24
GCD of 21 and 72 is 3. Simplified: 21/3 : 72/3 = 7:24
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 / 67 | 21:67 |
| 21 / 70 | 3:10 |
| 21 / 71 | 21:71 |
| 21 / 73 | 21:73 |
| 21 / 74 | 21:74 |
| 21 / 77 | 3:11 |
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.