Alright, let's work through 9990 times 6315 step by step
9990 × 6315 = 6315 × (9990)
+ 6315 × 0 that results in 0
+ 6315 × 90 which equals 568350
+ 6315 × 900 which equals 5683500
+ 6315 × 9000 giving us 56835000

= 63086850
