The numbers 12, 34, 56, 78, 90 are five two-digit numbers that use all ten digits. Which five two-digit numbers that use all ten digits
have the largest possible product?

90, 81, 72, 63, 54

Step-by-step explanation:

I think that these numbers make up the most possible product. Having the larger numbers on the side as the tens digit would be a better way of making the product bigger so that you can leave the smaller numbers for the smaller ones digit.