Calculate Cuboid Volume: 12cm Width with 40% Length and 30% Height Proportions

Volume Calculations with Percentage Dimensions

Given the cuboid whose width is 12 cm

Its length is equal to 40% of the width of the cuboid.

The height of the cuboid is equal to 30% of width

Calculate the volume of the cube

121212

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Calculate the volume of the box
00:03 Width of the box according to the data
00:07 Length of the box according to the data, convert percentage to number
00:18 This is the box length
00:25 Height of the box according to the data, convert percentage to number
00:36 This is the box height
00:39 Use the formula to calculate box volume
00:42 Width times height times length
00:49 Substitute appropriate values and solve for volume
00:59 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Given the cuboid whose width is 12 cm

Its length is equal to 40% of the width of the cuboid.

The height of the cuboid is equal to 30% of width

Calculate the volume of the cube

121212

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given information and calculate the length and height.

  • Step 2: Apply the formula for the volume of a cuboid.

  • Step 3: Perform the necessary calculations to find the volume.

Now, let's work through each step:

Step 1: Identify the given information and calculate the dimensions

We know the cuboid has a width of w=12 w = 12 cm. The length l l is stated to be 40% of this width. Thus, we calculate:
l=0.4×12=4.8 l = 0.4 \times 12 = 4.8 cm.

The height h h is 30% of the width, so:
h=0.3×12=3.6 h = 0.3 \times 12 = 3.6 cm.

Step 2: Apply the formula for the volume of a cuboid

The formula for the volume of a cuboid is given by V=l×w×h V = l \times w \times h .

Step 3: Calculate the volume

Now, substitute the values for l l , w w , and h h :
V=4.8×12×3.6=207.36 V = 4.8 \times 12 \times 3.6 = 207.36 cm³.

Therefore, the volume of the cuboid is 207.36 207.36 cm³.

3

Final Answer

207.36 cm³

Key Points to Remember

Essential concepts to master this topic
  • Formula: Volume of cuboid equals length × width × height
  • Technique: Convert percentages first: 40% of 12 = 4.8 cm
  • Check: Verify dimensions make sense: 4.8 × 12 × 3.6 = 207.36 cm³ ✓

Common Mistakes

Avoid these frequent errors
  • Using percentages directly in volume formula
    Don't use 40% and 30% as actual measurements = impossible negative or decimal volume! Percentages must be converted to actual measurements first. Always calculate the actual dimensions: 40% of 12 = 4.8 cm and 30% of 12 = 3.6 cm before finding volume.

Practice Quiz

Test your knowledge with interactive questions

A rectangular prism has a base measuring 5 units by 8 units.

The height of the prism is 12 units.

Calculate its volume.

121212888555

FAQ

Everything you need to know about this question

How do I convert percentages to actual measurements?

+

To convert a percentage to actual measurement: multiply the percentage (as a decimal) by the reference value. For example: 40% of 12 cm = 0.4 × 12 = 4.8 cm.

Why can't I just multiply 12 × 40 × 30?

+

Because 40 and 30 are percentages, not actual measurements! You need the actual dimensions in centimeters: length = 4.8 cm, height = 3.6 cm, then multiply 4.8 × 12 × 3.6.

What does 'cuboid' mean compared to 'cube'?

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A cuboid is a rectangular box where all sides can be different lengths. A cube has all sides equal. This problem uses 'cuboid' correctly since the dimensions are different.

How do I remember the volume formula?

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Think of filling a box: you need to know how long, how wide, and how tall it is. Volume = length × width × height tells you how many unit cubes fit inside!

What units should my final answer have?

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Since all dimensions are in centimeters (cm), the volume will be in cubic centimeters (cm³). Always cube the unit when finding volume!

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