Alright, let's work through 3890 times 4151 step by step
3890 × 4151 = 4151 × (3890)
+ 4151 × 0 giving us 0
+ 4151 × 90 giving us 373590
+ 4151 × 800 that is equal 3320800
+ 4151 × 3000 what gives us 12453000

= 16147390
