Help with Random number to group

Hi, wondering if anyone can help me figure something out?

I got Groups of cards and there are 9 cards in each group numbered in squence
If I pick a random card number I need to figure out how to determine which group that card number belongs too

Groups
1 2 3
---------
1 10 19
2 11 20
3 12 21
4 13 22
5 14 23
6 15 24
7 16 25
8 17 26
9 18 27


Say I pick a random card number of 12 > How to return the value of which Group that card belongs too?
Obviously it's group 2 but I am struggling to find a good way to accomplish this.

Random Card=12
Group Number=

Any thoughts?

Thanks in advance

Quote from aenever

I'm not sure how elegant you wanted your solution. This works, I used an example that NaitorStudios created and modified it ever so slightly.

Please login to see this attachment.

Nice but not quite what I need.

Thank you for the reply and effort

Quote from defisym

With the help of array object, or add a prefix, e.g., 10001, 10012, 10023, divide 10000 to get group ID.

I want to stay away from an array for this particular issue
Not quite understandin how dividing 10000 into the number using a prefix would work, unless I'm missing something

Thanks for the response,

appreciate it

Found a good work around

Just added 2 Values to each group of cards and used them to keep track of each groups Min/Max card counts

Min_CardNum
Max_CardNum

Run a ForEach Loop on the group of cards to check if the current Random card picked is value within Range of Min_CardNum/Max_CardNum values

Works perfect

Quote from MuddyMole

Unless I'm missing something, it's just: floor(card_number / 9) + 1
Even the floor() part is not really needed in most cases (only if there's a chance that the card_number could somehow be a float).

Hey,

Tried that and that doesn't work but thank you for the response

Quote from defisym

Just like setting multiple flags in one value, e.g., R = color & 0xFF

The value saved: ID * a number big enough + actual value.
Get ID: value / a number big enough
Get actual value: value mod a number big enough

Ok, thank you