Alright, let's work through 1605 times 7816 step by step
1605 × 7816 = 7816 × (1605)
+ 7816 × 5 that is equal 39080
+ 7816 × 00 giving us 0
+ 7816 × 600 that results in 4689600
+ 7816 × 1000 resulting in 7816000

= 12544680
