Alright, let's work through 8205 times 456 step by step
8205 × 456 = 456 × (8205)
+ 456 × 5 that is equal 2280
+ 456 × 00 that results in 0
+ 456 × 200 that is equal 91200
+ 456 × 8000 giving us 3648000

= 3741480
