Express each of the following as indicated
3.5 dm expressed in mm

Answer

To convert 3.5 decimeters (dm) into millimeters (mm), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Conversion Factors**:
- We know that:
- 1 decimeter (dm) = 10 centimeters (cm)
- 1 centimeter (cm) = 10 millimeters (mm)

2. **Combine the Conversion Factors**:
- From the above, we can deduce:
- 1 decimeter (dm) = 10 cm × 10 mm/cm = 100 mm
- Therefore, 1 dm = 100 mm.

3. **Calculate the Conversion for 3.5 dm**:
- Now, to convert 3.5 dm into mm, we multiply by the conversion factor:
- 3.5 dm × 100 mm/dm = 350 mm

4. **Final Result**:
- Thus, 3.5 decimeters expressed in millimeters is 350 mm.

### Final Answer:
3.5 dm = 350 mm