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Flat or Solid? is a free printable Kindergarten maths worksheet on distinguishing two and three dimensions, aligned to Common Core standard K.G.A.3. It prints 5 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 23 of 25 · the same problems every time you open this link.

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One paper per pupil

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Flat or Solid?

K.G.A.3

NameDate

Sort each one into the right box.

1.Sort each one into the right box.

Sort: cone, triangle, hexagon, cube

FlatSolid
2.Sort each one into the right box.

Sort: pyramid, cone, triangle, sphere

FlatSolid
3.Sort each one into the right box.

Sort: circle, cube, cone, pentagon

FlatSolid
4.Sort each one into the right box.

Sort: circle, pentagon, pyramid, square

FlatSolid
5.Sort each one into the right box.

Sort: triangle, circle, prism, sphere

FlatSolid

LessonPrint · K.G.A.3 · Set 23 · free to copy for classroom use

Answer key — Flat or Solid?

Set 23. Prints on its own sheet.

  1. 1.Flat: triangle, hexagon; Solid: cone, cube
  2. 2.Flat: triangle; Solid: pyramid, cone, sphere
  3. 3.Flat: circle, pentagon; Solid: cube, cone
  4. 4.Flat: circle, pentagon, square; Solid: pyramid
  5. 5.Flat: triangle, circle; Solid: prism, sphere

More practice for K.G.A.3

Tell flat shapes apart from solid ones.

Teaching this next? Flat Shapes and Solid Shapes is the 30-minute plan for it, with the misconceptions to expect.

All Kindergarten worksheets

Last reviewed 2026-09-05. Aligned to K.G.A.3 of the Common Core State Standards for mathematics.