Alright, let's work through 3638 times 205 step by step
3638 × 205 = 205 × (3638)
+ 205 × 8 yielding 1640
+ 205 × 30 that is equal 6150
+ 205 × 600 that is equal 123000
+ 205 × 3000 giving us 615000

= 745790
