Alright, let's work through 2115 times 5800 step by step
2115 × 5800 = 5800 × (2115)
+ 5800 × 5 yielding 29000
+ 5800 × 10 producing 58000
+ 5800 × 100 what gives us 580000
+ 5800 × 2000 that equals 11600000

= 12267000
