Alright, let's work through 99711001 times 87546203 step by step
99711001 × 87546203 = 87546203 × (99711001)
+ 87546203 × 1 what gives us 87546203
+ 87546203 × 00 resulting in 0
+ 87546203 × 000 that equals 0
+ 87546203 × 1000 giving us 87546203000
+ 87546203 × 10000 resulting in 875462030000
+ 87546203 × 700000 yielding 61282342100000
+ 87546203 × 9000000 that results in 787915827000000
+ 87546203 × 90000000 that results in 7879158270000000

= 8729319534879203
