Alright, let's work through 9643 times 166 step by step
9643 × 166 = 166 × (9643)
+ 166 × 3 that is equal 498
+ 166 × 40 that is equal 6640
+ 166 × 600 that is equal 99600
+ 166 × 9000 which equals 1494000

= 1600738
