Final answer:
To find the product of 20 x 9 x 5, multiply the three numbers together to get 900. The commutative property of multiplication is used in this calculation.
Step-by-step explanation:
To find the product of 20 x 9 x 5, we simply multiply the three numbers together. So, 20 x 9 x 5 = 900. The property used here is the commutative property of multiplication, which states that the order in which numbers are multiplied does not affect the result. In this case, we can multiply 20 x 9 first, or 9 x 5 first, and still get the same product of 900.