Mathematics Grade 7 15 min

Volume of rectangular prisms made of unit cubes

Volume of rectangular prisms made of unit cubes

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Introduction & Learning Objectives

Learning Objectives Define a unit cube and explain its role in measuring volume. Visualize and count unit cubes to determine the volume of simple rectangular prisms. Identify the length, width, and height of a rectangular prism constructed from unit cubes. Apply the formula V = l × w × h to calculate the volume of rectangular prisms. Use appropriate cubic units when expressing the volume of a rectangular prism. Solve real-world problems involving the volume of rectangular prisms made of unit cubes. Ever wonder how much space a box takes up, or how many small blocks fit inside a larger container? 📦 We're about to uncover the secret to measuring that 'space'! In this lesson, you'll learn how to calculate the volume of rectangular prisms by understanding w...
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Key Concepts & Vocabulary

TermDefinitionExample Rectangular PrismA three-dimensional solid object with six rectangular faces. Think of a brick, a shoebox, or a building block.A standard brick is a rectangular prism. Its faces are all rectangles. Unit CubeA cube with sides of length 1 unit. It is the basic building block for measuring volume.A 1 cm x 1 cm x 1 cm cube is a unit cube, often called a cubic centimeter ($1 \text{ cm}^3$). VolumeThe amount of three-dimensional space occupied by an object. It tells us how many unit cubes can fit inside a shape.If a box can hold 24 sugar cubes (each 1 cubic unit), its volume is 24 cubic units. Length (l)One of the three dimensions of a rectangular prism, typically representing how long the object is.In a prism made of unit cubes, the length is the number of unit cubes alon...
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Core Formulas

Volume by Counting Unit Cubes (Conceptual) Volume = (Number of cubes in one layer) $\times$ (Number of layers) This rule helps visualize volume as stacking layers of unit cubes. First, find the area of the base (cubes in one layer), then multiply by the number of layers (height). Volume of a Rectangular Prism Formula $V = l \times w \times h$ This is the primary formula for calculating the volume of any rectangular prism. 'l' stands for length, 'w' for width, and 'h' for height. Multiply these three dimensions together. Volume using Base Area $V = B \times h$ Where 'B' represents the area of the base of the rectangular prism ($B = l \times w$), and 'h' is the height. This formula emphasizes that volume is the base are...

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Sample Practice Questions

Challenging
A solid rectangular prism measuring 5 units long, 4 units wide, and 3 units high is made from unit cubes. It is painted on all six of its outer faces. How many of the unit cubes have exactly zero faces painted?
A.12
B.24
C.60
D.6
Challenging
A large cube with a side length of 4 units is made of smaller unit cubes. If the entire outer layer of unit cubes is removed, what is the volume of the remaining inner cube?
A.64 cubic units
B.56 cubic units
C.8 cubic units
D.27 cubic units
Challenging
The sum of the length, width, and height of a rectangular prism is 12 units. If all three dimensions are different whole numbers, what is the greatest possible volume of the prism?
A.54 cubic units
B.60 cubic units
C.64 cubic units
D.56 cubic units

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