Alright, let's work through 8100 times 3156 step by step
8100 × 3156 = 3156 × (8100)
+ 3156 × 0 which equals 0
+ 3156 × 00 that equals 0
+ 3156 × 100 yielding 315600
+ 3156 × 8000 that results in 25248000

= 25563600
