1. The problem asks if you need to convert centimeters (cm) to millimeters (mm) when finding the nearest millimeter. 2. The key fact is that 1 cm equals 10 mm. 3. To find the nearest millimeter, you must express the measurement in millimeters because rounding to the nearest millimeter means rounding to the nearest whole number in mm. 4. For example, if you have 2.34 cm, convert it to mm by multiplying by 10: $$2.34 \text{ cm} \times 10 = 23.4 \text{ mm}$$ 5. Now round 23.4 mm to the nearest whole number: $$23.4 \approx 23 \text{ mm}$$ 6. So yes, you convert the figures to millimeters before rounding to the nearest millimeter to ensure accuracy. This is the correct approach for any measurement given in cm when you need the nearest mm.