Use the 'double-3 down' dominoes to make a square so that each side has eight dots.
Use these four dominoes to make a square that has the same number of dots on each side.
There were chews for 2p, mini eggs for 3p, Chocko bars for 5p and
lollypops for 7p in the sweet shop. What could each of the children
buy with their money?
Several of you noticed that the numbers you
end up with in the matrix always add up to 10 - to fit in with
NRICH's 10th anniversary! A whole group of pupils from Gorseland
Primary School worked hard on the first matrix in pairs,
discovering how it works, making their own and solving this
problem. They found this solution for the first matrix:
George from Greenwich solved the second and
third matrices as well. For the second one, he says:
For the third matrix, George
You can check that this is the same as
the matrix in the problem! Excellent George, thank you for sending
in your solutions.