Alright, let's work through 99310006 times 72890003 step by step
99310006 × 72890003 = 72890003 × (99310006)
+ 72890003 × 6 producing 437340018
+ 72890003 × 00 which equals 0
+ 72890003 × 000 resulting in 0
+ 72890003 × 0000 which equals 0
+ 72890003 × 10000 that equals 728900030000
+ 72890003 × 300000 producing 21867000900000
+ 72890003 × 9000000 which equals 656010027000000
+ 72890003 × 90000000 giving us 6560100270000000

= 7238706635270018
