Alright, let's work through 99993943 times 87512307 step by step
99993943 × 87512307 = 87512307 × (99993943)
+ 87512307 × 3 yielding 262536921
+ 87512307 × 40 that is equal 3500492280
+ 87512307 × 900 that results in 78761076300
+ 87512307 × 3000 resulting in 262536921000
+ 87512307 × 90000 producing 7876107630000
+ 87512307 × 900000 that results in 78761076300000
+ 87512307 × 9000000 that equals 787610763000000
+ 87512307 × 90000000 which equals 7876107630000000

= 8750700637956501
