To determine how many **1800 mm** lengths fit into **14 m**, we first need to convert everything into the same unit. Since both values involve meters and millimeters, let’s align them for clarity.

1. **Convert 14 meters to millimeters**:  
   \[ 14 \, \text{m} = 14 \times 1000 = 14000 \, \text{mm} \]  

2. **Divide 14000 mm by 1800 mm**:  
   \[ \frac{14000}{1800} = 7.777\ldots \]

3. Since only **whole lengths** count, you can fit **7 full 1800 mm lengths** into 14 meters.

4. **Remaining material** after 7 lengths:
   \[ 14000 - (7 \times 1800) = 14000 - 12600 = 1400 \, \text{mm} \]  
   So, there will be **1400 mm** of unused material.

### Answer:
- **7 full 1800 mm lengths** fit into 14 m, with **1400 mm left over**.

Would you like further details or have any questions?

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1. How do you convert between millimeters and meters in general?  
2. What if the remaining 1400 mm were to be reused—how could it be split?  
3. How would the answer change if 14 m were expressed in centimeters instead?  
4. How would you calculate if the lengths were not whole numbers (e.g., decimals)?  
5. What happens if the 1800 mm pieces need some extra gap between them?

**Tip:** Always ensure units are consistent throughout the calculation to avoid mistakes.

Learn how to determine how many 1800 mm lengths fit into a 14-meter space by converting units and dividing the total length. This problem involves measurement conversion and division, ideal for students in Grades 5-7.

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