Constructive Triangles - Rectangular Box

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Constructive Triangles - Rectangular Box
Sensorial - Visual Discrimination of Form
Rectangular Box 2.JPG
LevelPrimary
Age4 +
PrerequisitesGeometric Cabinet
MaterialsRectangular Box of Constructive Triangles

Use of this material makes the child aware that all polygons can be made with triangles. This activity prepares the child for geometry.

Presentation

  1. Invite the child to the lesson. Name the work and show them where it is on the shelf.
  2. Unroll a large mat (or put two smaller mats side by side).
  3. Take the box of triangles to the mat.
  4. Lay the triangles so that the ones that go together are in columns.
    Rectangular Box 1.JPG
  5. Slide down the bottom triangle for the first shape.
  6. Trace over the black line on it with your index and middle fingers.
  7. Trace the black line on the corresponding triangle.
  8. Slide down the second triangle so the black lines meet.
  9. Do the same with the other shapes.
    Rectangular Box 2.JPG

Points of Interest

Control of Error

The black lines serve as a control of error when constructing the shapes.

Variations and Extensions

Material

Make Your Own

Printable version available to buy here:

Where to Buy

Prices and links checked: 07 October 2020

Set of 5 Constructive Triangle Boxes
Store Price
Adena $88.95
Alison's
plastic
$27.00
Alison's $157.60
Bruins $290.00
E & O $130.50
Hello Wood $328.00
Kid Advance $89.99
Leader Joy $99.95
Materials Co. of Boston $230.00
Montessori Outlet $98.95
Neinhuis $191.36
Thinkamajigs $119.95
Blue Triangles Box
Store Price
Adena $18.69
Alison's $38.25
Bruins $45.00
E & O $21.60
Hello Wood $53.00
Kid Advance $18.99
Leader Joy $20.95
Materials Co. of Boston $31.00
Montessori N' Such $15.01
Montessori Outlet $18.95
Nienhuis $43.51
Thinkamajigs $17.95

Further Reading