Alright, let's work through 8645 times 9979 step by step
8645 × 9979 = 9979 × (8645)
+ 9979 × 5 that equals 49895
+ 9979 × 40 giving us 399160
+ 9979 × 600 yielding 5987400
+ 9979 × 8000 giving us 79832000

= 86268455
