Alright, let's work through 3396 times 9957 step by step
3396 × 9957 = 9957 × (3396)
+ 9957 × 6 yielding 59742
+ 9957 × 90 resulting in 896130
+ 9957 × 300 what gives us 2987100
+ 9957 × 3000 that is equal 29871000

= 33813972
