Constructive Triangle - Large Hexagonal Box. Montessori Sensorial Lesson

Constructive Triangles -
Large Hexagonal Box
Material:
A large hexagonal box
2 red obtuse-angled isosceles triangles with a black line on the side opposite the obtuse angle
2 gray obtuse-angled isosceles triangles with a black line on one of the sides enclosing the obtuse angle
6 yellow obtuse-angled isosceles triangles: 3 with a black line on the opposite side of the obtuse angle and 3 with black lines on both equal sides
1 yellow equilateral triangle which sides equal the longest side of the other triangles, these have a black line on all 3 sides
A rug or large table
Presentation:
Invite a child
Introduce the activity
Have the child set up the floor mat
Have the child carry the box to the floor mat and sit-down
Open the box and Take all the triangles and place them around the box
Close the box and place it on the right corner
Isolate the red triangle,
Look for the matching one, take the other red triangle. Join them together on the black lines
Place it on top left corner
Take one grey triangle, look for the matching one
Take the other grey one and join them together on the black lines
Put it next to the red ones
Take one yellow triangle, look for the matching one and join them together
Take the large yellow triangle, look for the other triangles that matched the sides of the large one to make hexagon
Pause
Flip the smaller triangles and put on top of the large triangle, say: “See” . Pause and observe.
Ask if the equilateral triangle (form by 3 yellow triangles) fit in the middle of the hexagon. Arrange them back into Hexagon.
Separate the hexagon into three rhombus
Compare the red rhumbas to the yellow one and super impose
Put the red rhombus on top of the yellow one
Compare the grey one to the yellow rhombus
Put the grey ones on top of the yellow rhombus
Put all the shapes on its original positions
Pause
Mix the triangles
Invite the child to do the activity
When he has done, show him to put away
Mix the triangles
Open the box
Put the activity in the box:
First: the hexagon, put at the bottom of the box, Second: the yellow ones, Third: They grey ones (on two sides space), Fourth: The red ones (on top of another)
Control of Error:
The black lines
Direct Purpose
To show the child what figures can be constructed by Isosceles obtuse angle triangle which is one-third of an equilateral triangles
Indirect Purpose:
Preparation for geometry
Age:
4 to 5