To calculate \(6 \times 5 \times 9 \times 4 \times 8\):
- First, calculate \(6 \times 5 = 30\).
- Next, calculate \(30 \times 9 = 270\).
- Then, calculate \(270 \times 4 = 1080\).
- Finally, calculate \(1080 \times 8 = 8640\).
So, \(6 \times 5 \times 9 \times 4 \times 8 = 8640\).