What is 3 × (3 × 8)? What is (3 × 3) × 8?

What is 3 × (2 × 5)? What is (3 × 2) × 5?

What is 2 × (3 × 9)? What is (2 × 3) × 9?

What is 2 × (1 × 9)? What is (2 × 1) × 9?
