Sort the houses in my street into different groups. Can you do it in any other ways?
The computer has made a rectangle and will tell you the number of spots it uses in total. Can you find out where the rectangle is?
Noah saw 12 legs walk by into the Ark. How many creatures did he see?
Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?
Place the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?
Place this "worm" on the 100 square and find the total of the four squares it covers. Keeping its head in the same place, what other totals can you make?
These Stage 1 and 2 problems haven't been solved yet. Why not take a look?