Alright, let's work through 3999 times 7023 step by step
3999 × 7023 = 7023 × (3999)
+ 7023 × 9 that equals 63207
+ 7023 × 90 that is equal 632070
+ 7023 × 900 that is equal 6320700
+ 7023 × 3000 resulting in 21069000

= 28084977
