Alright, let's work through 3990 times 563 step by step
3990 × 563 = 563 × (3990)
+ 563 × 0 yielding 0
+ 563 × 90 that is equal 50670
+ 563 × 900 resulting in 506700
+ 563 × 3000 resulting in 1689000

= 2246370
