Alright, let's work through 8158 times 9772 step by step
8158 × 9772 = 9772 × (8158)
+ 9772 × 8 that results in 78176
+ 9772 × 50 yielding 488600
+ 9772 × 100 which equals 977200
+ 9772 × 8000 resulting in 78176000

= 79719976
