Alright, let's work through 99423943 times 78799406 step by step
99423943 × 78799406 = 78799406 × (99423943)
+ 78799406 × 3 giving us 236398218
+ 78799406 × 40 producing 3151976240
+ 78799406 × 900 that equals 70919465400
+ 78799406 × 3000 what gives us 236398218000
+ 78799406 × 20000 that is equal 1575988120000
+ 78799406 × 400000 which equals 31519762400000
+ 78799406 × 9000000 what gives us 709194654000000
+ 78799406 × 90000000 producing 7091946540000000

= 7834547650577858
