Follow the clues to find the mystery number.
You have 4 red and 5 blue counters. How many ways can they be
placed on a 3 by 3 grid so that all the rows columns and diagonals
have an even number of red counters?
You can trace over all of the diagonals of a pentagon without
lifting your pencil and without going over any more than once. Can
the same thing be done with a hexagon or with a heptagon?
The Maths Group from Devonshire Primary
sent in some solutions that they found so that the differences
between joined squares is odd:
Children from Merton Park
Well done - you're spot on and in fact that
means there are many solutions - thousands! Taranjot and Amrita
at Alexandra Junior School point out that:
Harmohan, Akash and Ayman also from Alexandra
School came up with some general rules about odd and even
Thank you to all those of you who sent