Kindergarten · Math · week 34

Flat or solid? Sorting real objects

Sort a group of real objects into flat shapes and solid shapes, explaining the difference.

This week you put it all together: flat shapes and solid shapes, side by side. A flat shape is like a drawing. It has no thickness you can hold. A solid shape takes up real space. You can pick it up and turn it around.

A picture of a circle is flat. A ball is solid. Sorting helps you see clearly which is which.

📋 For the teacher
Teach it (10–15 min):
  • Gather a mixed pile: some drawings or flat toys, some real solid objects. Sort together.
  • Ask can I pick this up and turn it all the way around, as the test for solid.
  • Connect back to week 6 (flat shapes) and week 33 (solid shapes) explicitly.
  • Celebrate clear thinking, not just a correct pile. Ask them to explain their sorting.
Talk about it:
  • What is the difference between a flat shape and a solid shape?
  • How did you decide where to sort each object?
  • Can you find one more flat and one more solid object right now?

Mastery looks like: They sort real objects into flat and solid groups correctly and explain their reasoning.

Common stumbles: Sorting by size or color instead of flat versus solid; forgetting that a picture of a solid object is still flat.

See it visually

Interactive, spoken-aloud tools that show this idea in motion.

SubtractionTake away and count back, step by step.try →
Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of Math for this learner.
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