Alright, let's work through 3870 times 3009 step by step
3870 × 3009 = 3009 × (3870)
+ 3009 × 0 that is equal 0
+ 3009 × 70 that equals 210630
+ 3009 × 800 that is equal 2407200
+ 3009 × 3000 producing 9027000

= 11644830
