Alright, let's work through 3499 times 840 step by step
3499 × 840 = 840 × (3499)
+ 840 × 9 that is equal 7560
+ 840 × 90 which equals 75600
+ 840 × 400 which equals 336000
+ 840 × 3000 that results in 2520000

= 2939160
