Alright, let's work through 99700100 times 7564837 step by step
99700100 × 7564837 = 7564837 × (99700100)
+ 7564837 × 0 resulting in 0
+ 7564837 × 00 that results in 0
+ 7564837 × 100 giving us 756483700
+ 7564837 × 0000 that equals 0
+ 7564837 × 00000 giving us 0
+ 7564837 × 700000 that equals 5295385900000
+ 7564837 × 9000000 giving us 68083533000000
+ 7564837 × 90000000 producing 680835330000000

= 754215005383700
