Alright, let's work through 3933 times 3531 step by step
3933 × 3531 = 3531 × (3933)
+ 3531 × 3 that results in 10593
+ 3531 × 30 giving us 105930
+ 3531 × 900 what gives us 3177900
+ 3531 × 3000 which equals 10593000

= 13887423
