Alright, let's work through 91015510 times 87997949 step by step
91015510 × 87997949 = 87997949 × (91015510)
+ 87997949 × 0 resulting in 0
+ 87997949 × 10 that results in 879979490
+ 87997949 × 500 giving us 43998974500
+ 87997949 × 5000 producing 439989745000
+ 87997949 × 10000 that results in 879979490000
+ 87997949 × 000000 producing 0
+ 87997949 × 1000000 that equals 87997949000000
+ 87997949 × 90000000 that equals 7919815410000000

= 8009178207188990
