Alright, let's work through 6204 times 7964 step by step
6204 × 7964 = 7964 × (6204)
+ 7964 × 4 yielding 31856
+ 7964 × 00 what gives us 0
+ 7964 × 200 resulting in 1592800
+ 7964 × 6000 what gives us 47784000

= 49408656
