Alright, let's work through 9942 times 4004 step by step
9942 × 4004 = 4004 × (9942)
+ 4004 × 2 giving us 8008
+ 4004 × 40 giving us 160160
+ 4004 × 900 which equals 3603600
+ 4004 × 9000 resulting in 36036000

= 39807768
