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Curved or Straight? is a free printable Kindergarten maths worksheet on classifying by edge type, aligned to Common Core standard K.G.B.4. 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 1 of 25 · the same problems every time you open this link.

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One paper per pupil

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All 25 sets ask different questions.

Curved or Straight?

K.G.B.4

NameDate

Sort each one into the right box.

1.Sort each one into the right box.

Sort: cone, square, triangle, hexagon

CurvedStraight
2.Sort each one into the right box.

Sort: triangle, pentagon, cube, cone

CurvedStraight
3.Sort each one into the right box.

Sort: cone, square, pentagon, circle

CurvedStraight
4.Sort each one into the right box.

Sort: cone, pentagon, hexagon, sphere

CurvedStraight
5.Sort each one into the right box.

Sort: cylinder, circle, pentagon, oval

CurvedStraight

LessonPrint · K.G.B.4 · Set 1 · free to copy for classroom use

Answer key — Curved or Straight?

Set 1. Prints on its own sheet.

  1. 1.Curved: cone; Straight: square, triangle, hexagon
  2. 2.Curved: cone; Straight: triangle, pentagon, cube
  3. 3.Curved: cone, circle; Straight: square, pentagon
  4. 4.Curved: cone, sphere; Straight: pentagon, hexagon
  5. 5.Curved: cylinder, circle, oval; Straight: pentagon

Questions about Curved or Straight?

What does the Curved or Straight? worksheet cover?

It practises classifying by edge type — 5 questions for Kindergarten, all on Common Core K.G.B.4: Compare shapes and describe how they are alike and different. The instruction to pupils is “Sort each one into the right box”, and the answer key follows on the next sheet.

Which Common Core standard does Curved or Straight? practise?

CCSS.MATH.CONTENT.K.G.B.4 — K.G.B.4, in the Geometry domain for Kindergarten. The published standard reads: “Analyze and compare two- and three-dimensional shapes, in different sizes and orientations, using informal language to describe their similarities, differences, parts, and other attributes.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Curved or Straight? is written for Kindergarten, typically ages 5-6. It is one of the sheets on K.G.B.4, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Curved or Straight? come with an answer key?

Yes. All 5 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.

How many different versions of Curved or Straight? can I print?

25 — one per pupil, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.

Is Curved or Straight? free to print and photocopy?

Yes. Curved or Straight?, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.

More practice for K.G.B.4

Compare shapes and describe how they are alike and different.

All Kindergarten worksheets

Last reviewed 2026-09-05. Aligned to K.G.B.4 of the Common Core State Standards for mathematics.