Using each of the 10 digits once, find two 5-digit numbers with the largest possible product.

Question

I am not sure how to solve this.  

Answer 1

97531 x 86420 = 8,428,629,020

 

96531 x 87420 = 8,438,740,020

 

96431 x 87520 = 8,439,641,120

 

96430 x 87521 = 8,439,650,030

 

96420 x 87531 = 8,439,739,020    this seems to be it