6.89 converted to mm

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}