Alright, let's work through 5185 times 402 step by step
5185 × 402 = 402 × (5185)
+ 402 × 5 that results in 2010
+ 402 × 80 which equals 32160
+ 402 × 100 producing 40200
+ 402 × 5000 that results in 2010000

= 2084370
