Alright, let's work through 90136941 times 89840434 step by step
90136941 × 89840434 = 89840434 × (90136941)
+ 89840434 × 1 producing 89840434
+ 89840434 × 40 that results in 3593617360
+ 89840434 × 900 resulting in 80856390600
+ 89840434 × 6000 resulting in 539042604000
+ 89840434 × 30000 that results in 2695213020000
+ 89840434 × 100000 which equals 8984043400000
+ 89840434 × 0000000 yielding 0
+ 89840434 × 90000000 that equals 8085639060000000

= 8097941898872394
