Alright, let's work through 1942 times 9158 step by step
1942 × 9158 = 9158 × (1942)
+ 9158 × 2 giving us 18316
+ 9158 × 40 giving us 366320
+ 9158 × 900 resulting in 8242200
+ 9158 × 1000 giving us 9158000

= 17784836
