Answer:
Step-by-step explanation:
The formula for the volume of a rectangular prism is V = w x h x l.
I think of it as multiplying all the values they give (which works in most cases, but beware of tricky wording that may say "base" instead)
18 cm x 9 cm x 5 cm = 810 cm³
Also, you can treat the "cm" as a variable, and it helps explain why it would be cubed in a volume- you're multiplying it by itself three times.
I hope this helped!
