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'Factors and Multiples Puzzle' printed from http://nrich.maths.org/
To try this puzzle you will need a copy of the playing board and
cards. You can
download a copy
- 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?
discuss a follow-up question related to this problem on the
NRICH Projects site.