Alright, let's work through 8991 times 964 step by step
8991 × 964 = 964 × (8991)
+ 964 × 1 that results in 964
+ 964 × 90 yielding 86760
+ 964 × 900 that is equal 867600
+ 964 × 8000 that equals 7712000

= 8667324
