Alright, let's work through 6715 times 7729 step by step
6715 × 7729 = 7729 × (6715)
+ 7729 × 5 that equals 38645
+ 7729 × 10 giving us 77290
+ 7729 × 700 that is equal 5410300
+ 7729 × 6000 that results in 46374000

= 51900235
