Alright, let's work through 6412 times 721 step by step
6412 × 721 = 721 × (6412)
+ 721 × 2 giving us 1442
+ 721 × 10 that results in 7210
+ 721 × 400 which equals 288400
+ 721 × 6000 producing 4326000

= 4623052
