Alright, let's work through 1990 times 9399 step by step
1990 × 9399 = 9399 × (1990)
+ 9399 × 0 that equals 0
+ 9399 × 90 yielding 845910
+ 9399 × 900 that is equal 8459100
+ 9399 × 1000 giving us 9399000

= 18704010
