Follow the clues to find the mystery number.
What do the digits in the number fifteen add up to? How many other
numbers have digits with the same total but no zeros?
A church hymn book contains 700 hymns. The numbers of the hymns are
displayed by combining special small single-digit boards. What is
the minimum number of small boards that is needed?
This was quite tricky but some of you made good solutions and
told us how you worked them out.
Sarah from Tattingstone School said she started off with O
because she could see that it left things unchanged. Here is her
Can you follow her description of what she did?
Here is another one from her friend Marion. She started with a
different idea but still gets the solution. Is one way quicker than