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?

The perimeter of the garden is 14 meters. To find how many 1800mm lengths of garden edging you need, first convert 14 meters to millimeters:

\[
14 \, \text{m} = 14 \times 1000 = 14000 \, \text{mm}
\]

Now, divide the total perimeter by the length of one piece of garden edging:

\[
\frac{14000 \, \text{mm}}{1800 \, \text{mm}} \approx 7.78
\]

Since you can't buy a fraction of a length, round up to the next whole number:

\[
\lceil 7.78 \rceil = 8
\]

So, you will need to buy **8 lengths** of garden edging.

Would you like further details or explanations on this? Here are some related questions:

1. How would the number of lengths change if the perimeter were 20 meters?
2. What is the total length of the garden edging you will buy in meters?
3. How many lengths would you need if each edging length were 1500mm instead?
4. Can you estimate the cost if each length of edging costs $10?
5. What is the difference in total length covered between 7 and 8 lengths of edging?

**Tip:** Always round up when purchasing physical items to ensure you have enough material.

Learn how to calculate the number of garden edging pieces needed for a 14m perimeter, using 1800mm lengths. This problem involves unit conversion, division, and rounding concepts. Suitable for students in Grades 5-7.

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