Alright, let's work through 7845 times 1009 step by step
7845 × 1009 = 1009 × (7845)
+ 1009 × 5 giving us 5045
+ 1009 × 40 resulting in 40360
+ 1009 × 800 that is equal 807200
+ 1009 × 7000 that results in 7063000

= 7915605
