Alright, let's work through 9925 times 8439 step by step
9925 × 8439 = 8439 × (9925)
+ 8439 × 5 yielding 42195
+ 8439 × 20 that is equal 168780
+ 8439 × 900 that is equal 7595100
+ 8439 × 9000 yielding 75951000

= 83757075
