How do you explain to class of first graders bout 3d shapes?

Answer 1

Try to bring in shapes that are 3D, pyramid, cube, sphere, etc. Explain why the object you are holding is 3 Demensional. Try also asking them why a certain shape is 3 Dimensional, for instance, "What does a 3 Dimensional Square look like?" Let them get interactive and explain to them that a 3 Dimensional object is 3 points measured within itself at the same equal length, width, and breadth.

Answer 2

With children you should always visually represent what you speak about. You will need some 3D objects which are not hard to pronounce, easy to hold, and easy to identify. Stick with your basic shapes: Cube, Pyramid, and Sphere. The objects highly resemble their one-dimensional counterpart.

You could also represent that a 3D object is something that you can hold in your hand. Explain that simple items like pencils, crayons, toys are all 3D objects because we can hold them. You could also appeal to visual learners using a white board or chalkboard to draw the basic shapes (Square, Triangle, Circle) and ask if they could hold this in their hands.

Children up to 2nd grade learn using the order of touching, seeing, hearing. Yes, hearing is their last learning tool, have you ever seen a Kindergartener sitting still for a 2 hour lecture about 3D spacial science and mathematics).