Alright, let's work through 4145 times 4022 step by step
4145 × 4022 = 4022 × (4145)
+ 4022 × 5 that equals 20110
+ 4022 × 40 yielding 160880
+ 4022 × 100 yielding 402200
+ 4022 × 4000 that results in 16088000

= 16671190
