Alright, let's work through 9991 times 45 step by step
9991 × 45 = 45 × (9991)
+ 45 × 1 yielding 45
+ 45 × 90 what gives us 4050
+ 45 × 900 what gives us 40500
+ 45 × 9000 that results in 405000

= 449595
