Alright, let's work through 3343 times 5803 step by step
3343 × 5803 = 5803 × (3343)
+ 5803 × 3 which equals 17409
+ 5803 × 40 which equals 232120
+ 5803 × 300 resulting in 1740900
+ 5803 × 3000 giving us 17409000

= 19399429
