1. Start with the value in centimeters: 6.89 \, \text{cm}
2. Use the conversion factor (1 cm = 10 mm): 6.89 \, \text{cm} \times 10 \, \frac{\text{mm}}{\text{cm}} = 68.9 \, \text{mm}
3. Therefore, the converted value is: 68.9 \, \text{mm}
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