Alright, let's work through 9249 times 8639 step by step
9249 × 8639 = 8639 × (9249)
+ 8639 × 9 that is equal 77751
+ 8639 × 40 giving us 345560
+ 8639 × 200 that results in 1727800
+ 8639 × 9000 that is equal 77751000

= 79902111
