Alright, let's work through 3540 times 2019 step by step
3540 × 2019 = 2019 × (3540)
+ 2019 × 0 resulting in 0
+ 2019 × 40 that is equal 80760
+ 2019 × 500 which equals 1009500
+ 2019 × 3000 that is equal 6057000

= 7147260
