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### Question (b)
**You need to add 10% for wastage. How many cubic meters of concrete do you need now? Write down the formula/method you used.**

The formula given is:
\[
0.11 \times 0.10 = 0.011 + 0.11 = 0.121 \, m^2
\]
So, the total cubic meters required after adding 10% wastage is **0.121 m²**.

### Question (c)
**You will need 13 bags of concrete mix for this job. Each bag is 20 kg. How many kgs of concrete will you need? Write down the formula/method you used.**

The formula used here is:
\[
20 \, \text{kg} \times 13 = 260 \, \text{kg}
\]
So, the total weight of concrete required is **260 kg**.

### Question (d)
**You will need to make the formwork. What is the perimeter of the concrete slab? Write down the formula you used.**

The formula for the perimeter \( P \) is:
\[
P = L + W + L + W = 1.5 \, \text{m} + 1.5 \, \text{m} + 1.5 \, \text{m} + 1.5 \, \text{m} = 6 \, \text{m}
\]
So, the perimeter is **6 meters**.

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Would you like a more detailed explanation of any of these steps, or do you have any other questions related to this? 

### 5 Related Questions:
1. How would you calculate the total cost of the concrete if you know the price per bag?
2. What is the difference between area (m²) and volume (m³), and how do you convert between them?
3. How can you account for additional variables like shrinkage in the concrete mix during construction?
4. How do you calculate the weight if the bag size or quantity changes?
5. What formula should be used if the shape of the slab is not rectangular but circular?

### Tip:
When calculating perimeter or area, always ensure units are consistent throughout the process to avoid errors.

You need to add 10% for wastage. How many cubic metres of concrete do you need now? Write down the formula/method you used.
You will need 13 bags of concrete mix for this job. Each bag is 20kg. How many kgs of concrete will you need? Write down the formula/method you used.
You will need to make the formwork. What is the perimeter of the concrete slab? Write down the formula you used.

Learn how to calculate concrete wastage by adding 10%, determine the total weight of concrete bags needed for a job, and find the perimeter of a concrete slab using the appropriate formulas. Suitable for students in Grades 6-8.

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