Alright, let's work through 8670 times 7621 step by step
8670 × 7621 = 7621 × (8670)
+ 7621 × 0 resulting in 0
+ 7621 × 70 producing 533470
+ 7621 × 600 that equals 4572600
+ 7621 × 8000 which equals 60968000

= 66074070
