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The question asks how many lengths of garden edging are required to cover a perimeter of 14 meters. Each length of garden edging is 1800 millimeters.

### Steps:
1. **Convert units:** Since the perimeter is in meters, convert the length of the edging into meters:
   \[
   1800 \, \text{mm} = 1.8 \, \text{m}
   \]
2. **Calculate the number of lengths needed:**
   \[
   \text{Number of lengths} = \frac{\text{Perimeter}}{\text{Length of edging}} = \frac{14 \, \text{m}}{1.8 \, \text{m}} \approx 7.78
   \]

3. **Round up:** Since you cannot purchase a fraction of a length, round up to the next whole number. This gives:
   \[
   \text{Required lengths} = 8
   \]

### Final Answer: 8 lengths

Would you like more details or further explanation on this? Here are some related questions to think about:

1. How would the calculation change if the edging came in different lengths?
2. What would be the total length of garden edging used if you buy 8 lengths?
3. How can you minimize waste if the garden shape doesn't exactly match the available lengths of edging?
4. What if the perimeter of the garden were 20 meters instead?
5. Can you think of any other units that could be used to measure the garden edging?

**Tip:** When dealing with different units, always ensure consistency in your measurements before calculating!

You need garden edging for a garden with a perimeter of 14m. Garden edging comes in 1800mm lengths. How many lengths will you need to buy to have enough edging for the entire perimeter?

Solve how many 1800mm garden edging lengths are needed for a garden with a 14m perimeter. This problem covers unit conversion, division, and rounding for practical math problems, suitable for students in Grades 5-7.

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