Alright, let's work through 75709990 times 67879919 step by step
75709990 × 67879919 = 67879919 × (75709990)
+ 67879919 × 0 what gives us 0
+ 67879919 × 90 giving us 6109192710
+ 67879919 × 900 resulting in 61091927100
+ 67879919 × 9000 that is equal 610919271000
+ 67879919 × 00000 giving us 0
+ 67879919 × 700000 producing 47515943300000
+ 67879919 × 5000000 resulting in 339399595000000
+ 67879919 × 70000000 what gives us 4751594330000000

= 5139187988690810
