Alright, let's work through 9923 times 3541 step by step
9923 × 3541 = 3541 × (9923)
+ 3541 × 3 that equals 10623
+ 3541 × 20 that results in 70820
+ 3541 × 900 what gives us 3186900
+ 3541 × 9000 which equals 31869000

= 35137343
