Alright, let's work through 7838 times 999 step by step
7838 × 999 = 999 × (7838)
+ 999 × 8 that is equal 7992
+ 999 × 30 producing 29970
+ 999 × 800 that equals 799200
+ 999 × 7000 giving us 6993000

= 7830162
