Alright, let's work through 3815 times 2789 step by step
3815 × 2789 = 2789 × (3815)
+ 2789 × 5 yielding 13945
+ 2789 × 10 resulting in 27890
+ 2789 × 800 yielding 2231200
+ 2789 × 3000 that equals 8367000

= 10640035
