Alright, let's work through 8685 times 9638 step by step
8685 × 9638 = 9638 × (8685)
+ 9638 × 5 which equals 48190
+ 9638 × 80 that is equal 771040
+ 9638 × 600 that equals 5782800
+ 9638 × 8000 yielding 77104000

= 83706030
