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?
Many of you have had an excellent stab at this
problem - it requires a lot of perseverance - and you have come up
with several ways, all of which take four steps. Matthew from
Gayhurst School suggests:
Tom, who goes to The Oratory Preparatory
School found a different way which is equally as quick:
Yet another way was discovered by Robert
from U-Hill Secondary and pupils from the Sutton
Pupils from Moorfield Junior School told us
about a fourth way:
Theo, Matthew, Seth and Jessie from
Christ Church Primary School went about it in this way:
This is interesting. I'm particularly
intrigued by the second line. I wonder why the calculator display
Fantastic - and to think it looked so