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?
We had several well-explained solutions to
this problem. Well done!
Yajur and Johar from the London Academy
Here is the image of their solution they
Hannah, Lily, Emma, Sarah, Fergus,
Nathan and Aleish from Rutherglen Primary told us about
how they tackled the problem. I like their approach of cutting the
numbers out. They said:
From there, they were able to solve the
problem in a very similar way to Yajur and Johar.
Gabriella from St Margaret's College
told us how she found a solution:
Thank you, Gabriella. I like the way
you're thinking about how the Chinese script works. (The Japanese
and Chinese number systems are essentially the same, but are
pronounced in different ways.) Gwendolyn from Sha Tin College in
Hong Kong explains her approach and she sheds some light on the
Gwendolyn says she was curious about the
other languages and went on the internet to find out about them.
She reports that C is Persian, D is Bengali and E is Gurmukhi. What
do others think? Did anyone else find out what they are?