To find the volume of a rectangular prism, we use a certain formula.
Volume = Length × Width × Height
Let's first find the volume of the rectangular prism on the right.
Length = 4 in.
Width = 4 in.
Height = 5 in.
(4) (6) (6) = 80 in.³
Now, let's find the volume of the rectangular prism on the left.
Length = 8 in.
Width = 10 in.
Height = 5 in.
(8) (10) (5) = 400 in.³
400 in.³ + 80 in.³ = 480 in.³