Alright, let's work through 8820 times 9135 step by step
8820 × 9135 = 9135 × (8820)
+ 9135 × 0 that is equal 0
+ 9135 × 20 resulting in 182700
+ 9135 × 800 giving us 7308000
+ 9135 × 8000 resulting in 73080000

= 80570700
