Final answer:
The volume of a rectangular prism made up of cubic units is found by multiplying the count of cubes along each dimension. The standard SI unit of volume is cubic meter, but cubic centimeters and liters are also common units used for smaller volumes.
Step-by-step explanation:
To calculate the volume of a rectangular prism when each cube is one cubic unit, you would use the formula for the volume of a prism, which is the product of the length, width, and height.
Since each cube represents one cubic unit, you would count the number of cubes along the length, width, and height, and then multiply these numbers together.
The SI unit of volume is the cubic meter (m³), which is the space occupied by a cube with 1m sides. However, for smaller measurements, other units such as the cubic centimeter (cm³) and the liter (L) are often used, where 1L is equivalent to one cubic decimeter (dm³) or 1000cm³.
In school settings, especially at the middle school level, the concept of cubic units is typically introduced to help students understand volume measurement.