Alright, let's work through 3890 times 4538 step by step
3890 × 4538 = 4538 × (3890)
+ 4538 × 0 giving us 0
+ 4538 × 90 what gives us 408420
+ 4538 × 800 that equals 3630400
+ 4538 × 3000 producing 13614000

= 17652820
