Isnumber(search results misleading

I've got a table 24x24 (excluding headers) the row and column headers will change depending on entries elsewhere in the workbook.
The column headers will either be single or double numbers - 1 / 2 / 3 / 4 / 5 or 1,2 / 3,4 / 5,6 / 7,8 / 9,10 or a combination - 1 / 2 / 3,4 / 5,6 etc
The row headers will be a list of the numbers - 1,2,3,4,5,6 / 3,4,9,10 / 1,2,5,6,9 etc.

My table is set out to show if the row header contains the column header and if so will show TRUE, if not FALSE.

The problem i'm having is when there's numbers over 10 or 20 etc the table will show true if the column headers have 1 or 2 as options.
Is there anyway for these to be discounted if the column header numbers aren't 1 or 2 and are 10s or 20s?

Sorry, i should say - numbers can appear on their own in both headings, when listed with another there will be a comma between them (no space)