Alright, let's work through 2939 times 1100 step by step
2939 × 1100 = 1100 × (2939)
+ 1100 × 9 yielding 9900
+ 1100 × 30 what gives us 33000
+ 1100 × 900 that is equal 990000
+ 1100 × 2000 producing 2200000

= 3232900
