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Simplify 21:70
The simplified ratio of 21:70 is 3:10. Free ratio calculator with GCD breakdown.
3:10
GCD of 21 and 70 is 7. Simplified: 21/7 : 70/7 = 3:10
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 / 65 | 21:65 |
| 21 / 68 | 21:68 |
| 21 / 69 | 7:23 |
| 21 / 71 | 21:71 |
| 21 / 72 | 7:24 |
| 21 / 75 | 7:25 |
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.