Mathematics
Grade 6
15 min
Volume of cubes and rectangular prisms
Volume of cubes and rectangular prisms
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1
Introduction & Learning Objectives
Learning Objectives
Define volume as the amount of space a three-dimensional object occupies.
Identify and distinguish between cubes and rectangular prisms based on their attributes.
Understand and correctly use cubic units (e.g., cm³, m³) to express volume.
Apply the formula $V = l \times w \times h$ to calculate the volume of rectangular prisms.
Apply the formula $V = s \times s \times s$ (or $V = s^3$) to calculate the volume of cubes.
Solve real-world problems involving the volume of cubes and rectangular prisms.
Have you ever wondered how much popcorn fits in a box at the movies? 🍿 Or how much water a fish tank can hold? 🐠
In this lesson, you'll learn all about 'volume' – the amount of space inside three-dimensional shapes like cubes and rectangular pr...
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Key Concepts & Vocabulary
TermDefinitionExample
VolumeThe amount of three-dimensional space occupied by an object or substance.The volume of a shoebox is how much space is inside it for shoes.
CubeA three-dimensional shape with six identical square faces. All its edges (sides) are the same length.A standard dice or a Rubik's Cube are examples of cubes.
Rectangular PrismA three-dimensional shape with six rectangular faces. Opposite faces are identical.A brick, a cereal box, or a refrigerator are common examples of rectangular prisms.
Length (l)The measurement of an object from one end to the other, typically the longest dimension of its base.The length of a classroom might be 10 meters.
Width (w)The measurement of an object from side to side, perpendicular to its length.The width of a classroom might be 8 mete...
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Core Formulas
Volume of a Rectangular Prism
$V = l \times w \times h$
To find the volume of a rectangular prism, multiply its length (l), width (w), and height (h). This formula tells you how many cubic units can fit inside the prism.
Volume of a Cube
$V = s \times s \times s$ or $V = s^3$
Since all sides of a cube are equal, you can find its volume by multiplying the length of one side (s) by itself three times.
Volume using Base Area
$V = B \times h$ (where $B$ is the area of the base)
For any prism, you can find its volume by multiplying the area of its base ($B$) by its height ($h$). For a rectangular prism, the base is a rectangle, so $B = l \times w$.
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Challenging
A rectangular prism has a volume of 300 cm³. If you double its length but keep the width and height the same, what will the new volume be?
A.300 cm³
B.150 cm³
C.1200 cm³
D.600 cm³
Challenging
A fish tank is 50 cm long, 20 cm wide, and 30 cm high. The tank is filled with water to 80% of its total capacity. What is the volume of the water in the tank?
A.30,000 cm³
B.24,000 cm³
C.6,000 cm³
D.3,000 cm³
Challenging
The length of a rectangular prism is three times its width. The height is half of its width. If the width is 4 cm, what is the volume of the prism?
A.24 cm³
B.48 cm³
C.96 cm³
D.192 cm³
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