Factors and Multiples Puzzle
Stage: 3 Challenge Level: 
To try this puzzle you will need a copy of the playing board
and cards. You can
download a copy to print.
- Cut out the $10$ heading cards and put one in each of the
$10$ spaces round the playing board.

- Cut out the $25$ number cards and place each one in a
different square on the playing board so that the number
satisfies the condition given by the heading card for that
row and the condition given by the heading card for
that column.

By rearranging the heading cards and the number cards, try to
fill as many squares on the playing board as possible.
Can you fill all the squares on the board at once?
You can
discuss a follow-up question related to this problem on
the NRICH Projects site.
search engine pagePublished September 2007,February 2010.