Alright, let's work through 3336 times 6412 step by step
3336 × 6412 = 6412 × (3336)
+ 6412 × 6 that results in 38472
+ 6412 × 30 which equals 192360
+ 6412 × 300 that is equal 1923600
+ 6412 × 3000 giving us 19236000

= 21390432
