AGE
4 to 4.5 years approx.
MATERIALS
Box 4 is a hexagonal box which contains the following 18 triangles:
1 yellow equilateral triangle with no black lines.
3 green equilateral triangles, two with the black lines on one side and one with black lines on two sides.
2 red equilateral triangles with the black line on one side.
6 red obtuse angle isosceles triangles with the black line opposite the obtuse angle
6 grey equilateral triangles with the black lines on two sides.
DIRECT AIM
To give the child the opportunity to experiment with various geometric shapes.
INDIRECT AIM
To discover, at a sensorial level, the various ways these shapes can be divided and combined to form other shapes.
For later work in Maths and Geometry.
PRESENTATION 1
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Individual exercise done at a table or on a floor mat.
- Take the 6 small grey equilateral triangles, construct a hexagon, keeping the non-line sides outwards. Invite the child to do the same after dismantling it for him. Put the hexagon to one side.
- Take the 1 yellow equilateral triangle and the three red obtuse angle triangles and make a hexagon.
- With the other 3 red obtuse angle triangles, allow the child to make an equilateral triangle on top of the yellow equilateral triangles, which was used to build the hexagon.
- Take away the yellow equilateral triangles and construct the hexagon using the 6 obtuse angle isosceles triangles.
- The two small equilateral triangles form a rhombus.
- The three small green equilateral triangles form a trapezium
- Look again at the grey hexagon, it divides into 2 trapeziums. Proceed to build the green trapezium on top of the grey trapezium. The grey hexagon also divides into 3 rhombi.
- The red hexagon will also divide into three rhombi.
- Give a three period lesson on the names of the various triangles.
PRESENTATION 2
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CONTROL OF ERROR
The black lines.
Visual