Brainteasers

Puzzles to test mathematical skills - for the answers turn to page 54

Ages 5-7: Jigsaw

First make a six by four grid.

1. Make eight pieces like this:

3. Now make six pieces like this:

2. Fit them all on the grid without making this shape:

4. Fit them all on the grid without making this shape:

Age 9-11: Count the triangles How many triangles can you see in the square?

Brainteaser solutions from page 54

Count the triangles

There are 44 triangles altogether - 10 in each quadrant, and the four largest, each equal in area to half of the square, are formed by the two diagonals of the square.

Jigsaw: Diagram

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