Alright, let's work through 2309 times 3540 step by step
2309 × 3540 = 3540 × (2309)
+ 3540 × 9 yielding 31860
+ 3540 × 00 producing 0
+ 3540 × 300 giving us 1062000
+ 3540 × 2000 that is equal 7080000

= 8173860
