Alright, let's work through 5640 times 9827 step by step
5640 × 9827 = 9827 × (5640)
+ 9827 × 0 giving us 0
+ 9827 × 40 producing 393080
+ 9827 × 600 yielding 5896200
+ 9827 × 5000 producing 49135000

= 55424280
