MAKING MARKS - AGE 7-9: Draw this grid. Put a mark on it as shown.

Put three more marks on the grid so that no two marks are in the same row or column, or in any of the 10 ‘diagonals’.

COINS ON THE TABLE - AGE 9-11:

Anna put some 10p coins on the table.

One half of them were tails up.

Anna turned over two of the coins, and one third of them were tails up.

How many coins did Anna put on the table?

BRAINTEASERS SOLUTIONS PAGE 54

Making marks - diagram not available on database

Coins on the table - Anna put 12 coins on tthe table