Alright, let's work through 7707 times 849 step by step
7707 × 849 = 849 × (7707)
+ 849 × 7 producing 5943
+ 849 × 00 yielding 0
+ 849 × 700 that is equal 594300
+ 849 × 7000 yielding 5943000

= 6543243
