Math worksheet with questions on volume, area, and perimeter.

Let's solve each problem step by step.

---

Problem 1: What is the volume of this box made up of 1 cm cubes?

#### Solution:
The box is composed of small cubes, each with a side length of 1 cm. To find the volume, we need to count the number of these 1 cm cubes in the box.

- The box has 3 layers (height).
- Each layer has 4 rows.
- Each row has 2 cubes.

So, the total number of cubes is:
\[
\text{Total cubes} = \text{Layers} \times \text{Rows per layer} \times \text{Cubes per row}
\]
\[
\text{Total cubes} = 3 \times 4 \times 2 = 24
\]

Since each cube has a volume of \(1 \, \text{cm}^3\), the total volume of the box is:
\[
\text{Volume} = 24 \, \text{cm}^3
\]

#### Answer:
\[
\boxed{a}
\]

---

Problem 2: What is the volume of a crate measuring 1 m by 2 m by 1.5 m?

#### Solution:
The volume of a rectangular prism (crate) is given by the formula:
\[
\text{Volume} = \text{Length} \times \text{Width} \times \text{Height}
\]

Here:
- Length = 1 m
- Width = 2 m
- Height = 1.5 m

Substitute these values into the formula:
\[
\text{Volume} = 1 \, \text{m} \times 2 \, \text{m} \times 1.5 \, \text{m} = 3 \, \text{m}^3
\]

#### Answer:
\[
\boxed{b}
\]

---

Problem 3: The area of a square is 36 cm². What is the length of its base?

#### Solution:
The area of a square is given by the formula:
\[
\text{Area} = \text{Side}^2
\]

Here, the area is \(36 \, \text{cm}^2\). Let the side length be \(s\). Then:
\[
s^2 = 36
\]

To find \(s\), take the square root of both sides:
\[
s = \sqrt{36} = 6 \, \text{cm}
\]

#### Answer:
\[
\boxed{a}
\]

---

Problem 4: A rectangular field has length 80 m. What is its width if the perimeter is 240 m?

#### Solution:
The perimeter of a rectangle is given by the formula:
\[
\text{Perimeter} = 2 \times (\text{Length} + \text{Width})
\]

Here:
- Perimeter = 240 m
- Length = 80 m
- Width = \(w\) (unknown)

Substitute the known values into the formula:
\[
240 = 2 \times (80 + w)
\]

Divide both sides by 2:
\[
120 = 80 + w
\]

Solve for \(w\):
\[
w = 120 - 80 = 40 \, \text{m}
\]

#### Answer:
\[
\boxed{b}
\]

---

Final Answers:

1. \(\boxed{a}\)
2. \(\boxed{b}\)
3. \(\boxed{a}\)
4. \(\boxed{b}\)