We're going to solve 81691874 multiplied by 50315312
81691874 × 50315312 = 50315312 × (81691874)
+ 50315312 × 4 yielding 201261248
+ 50315312 × 70 giving us 3522071840
+ 50315312 × 800 yielding 40252249600
+ 50315312 × 1000 producing 50315312000
+ 50315312 × 90000 producing 4528378080000
+ 50315312 × 600000 giving us 30189187200000
+ 50315312 × 1000000 producing 50315312000000
+ 50315312 × 80000000 producing 4025224960000000

= 4110352128174688
