Alright, let's work through 3638 times 5 step by step
3638 × 5 = 5 × (3638)
+ 5 × 8 that results in 40
+ 5 × 30 which equals 150
+ 5 × 600 that is equal 3000
+ 5 × 3000 that results in 15000

= 18190
