Constructive Triangles - Rectangular Box

From Montessori Album
Constructive Triangles - Rectangular Box
Sensorial - Visual Discrimination of Form
Rectangular Box 2.JPG
Age4 +
PrerequisitesGeometric Cabinet
Constructive Triangles - Triangular Box

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


  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

Variations and Extensions


Make Your Own

Printable Constructive Triangles available from Livable Learning.

Where to Buy

All 5 Constructive Triangle Boxes
Adena $69.96
Adena $41.39 (only 3 constructive triangle boxes)
Albanesi $505.00
Alison's $150.00
Best Montessori Toys $50.48
Bruins $274.00
Cabdev $285.00
Caliber $77.99
Creative Learning $79.95
E & O $290.00
Hello Wood $289.00
Juliana Group $470.40
Kid Advance $69.99
Montessori Land $99.00
Montessori N' Such $185.00
Montessori Outlet $72.95
Thinkamajigs $119.95
montessorialbum $23 (Constructive Triangles In Five Boxes)