Alright, let's work through 8399 times 7783 step by step
8399 × 7783 = 7783 × (8399)
+ 7783 × 9 giving us 70047
+ 7783 × 90 yielding 700470
+ 7783 × 300 that equals 2334900
+ 7783 × 8000 that is equal 62264000

= 65369417
