Ramon numbers from a list with no duplicates

So i am looking to create a bingo card 5x5 grid with random numbers from a list. Students will have to solve equations so i will have a list of all the answers.

What i am basically looking for is how to write the formula so that it is linked to the list of answers.

Se attached sample

I don't understand how the numbers and Answers go together. Are there questions/equations that I am not seeing? I can set up the cards like a normal random bingo card but based on the negative numbers, that's not what you want. Explain what you are doing a little more and maybe I can figure it out.

Okay, here's how to get random numbers from -20 to +20 (I think that is what you are trying to do) in your bingo cards. on "Answers" insert additional columns next to each Card and enter = RAND() into those extra columns.

Using Card1 as an example. In A3 copied and pasted to all other squares on the card

=INDEX(Answers!$B$2:$B$42, MATCH(SMALL(Answers!$A$2:$A$42, (ROWS($A$1:$A1)+5*(COLUMNS($A$1:A$1)-1))),Answers!$A$2:$A$42,0))

This finds the position of the smallest random number in A and returns the value in B of the same row.
See attachment.