Alright, let's work through 1018 times 405 step by step
1018 × 405 = 405 × (1018)
+ 405 × 8 that results in 3240
+ 405 × 10 which equals 4050
+ 405 × 000 giving us 0
+ 405 × 1000 which equals 405000

= 412290
