Alright, let's work through 8128 times 7990 step by step
8128 × 7990 = 7990 × (8128)
+ 7990 × 8 resulting in 63920
+ 7990 × 20 that equals 159800
+ 7990 × 100 that results in 799000
+ 7990 × 8000 giving us 63920000

= 64942720
