Why do this problem?
is a good introduction to matrices. It provides experience in completing tables as well as offering plenty of number work.
Modelling how to fill in matrices like these might be a good place to start as pupils may not have encountered them before. You may find these sheets useful.
Is this number odd or even?
Which tables will you find this number in?
How about going through the numbers in order, starting with $1$?
Is $1$ a multiple of $2$? Is it greater than $5$?
Learners could try a slightly more difficult problem using multiples Grouping Goodies
or a much harder one with a table to complete, Mystery Matrix.
Suggest using numbered counters and these sheets