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Sort by Number of Sides is a free printable Grade 3 maths worksheet on grouping shapes by a shared attribute, aligned to Common Core standard 3.G.A.1. 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.

Sort by Number of Sides

3.G.A.1

NameDate

Sort each one into the right box.

1.Sort each one into the right box.

Sort: trapezoid, oblong, octagon, square

4 sidesMore than 4 sides
2.Sort each one into the right box.

Sort: oblong, pentagon, rhombus, kite

4 sidesMore than 4 sides
3.Sort each one into the right box.

Sort: octagon, rhombus, rectangle, oblong

4 sidesMore than 4 sides
4.Sort each one into the right box.

Sort: octagon, rectangle, heptagon, pentagon

4 sidesMore than 4 sides
5.Sort each one into the right box.

Sort: rectangle, heptagon, trapezoid, square

4 sidesMore than 4 sides

LessonPrint · 3.G.A.1 · Set 1 · free to copy for classroom use

Answer key — Sort by Number of Sides

Set 1. Prints on its own sheet.

  1. 1.4 sides: trapezoid, oblong, square; More than 4 sides: octagon
  2. 2.4 sides: oblong, rhombus, kite; More than 4 sides: pentagon
  3. 3.4 sides: rhombus, rectangle, oblong; More than 4 sides: octagon
  4. 4.4 sides: rectangle; More than 4 sides: octagon, heptagon, pentagon
  5. 5.4 sides: rectangle, trapezoid, square; More than 4 sides: heptagon

Questions about Sort by Number of Sides

What does the Sort by Number of Sides worksheet cover?

It practises grouping shapes by a shared attribute — 5 questions for Grade 3, all on Common Core 3.G.A.1: Group shapes by what they have in common. 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 Sort by Number of Sides practise?

CCSS.MATH.CONTENT.3.G.A.1 — 3.G.A.1, in the Geometry domain for Grade 3. The published standard reads: “Understand that shapes in different categories may share attributes, and that shared attributes can define a larger category.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Sort by Number of Sides is written for Grade 3, typically ages 8-9. It is one of the sheets on 3.G.A.1, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Sort by Number of Sides 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 Sort by Number of Sides 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 Sort by Number of Sides free to print and photocopy?

Yes. Sort by Number of Sides, 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.

Is there a lesson plan to teach 3.G.A.1?

Yes — “Sorting Shapes by Shared Attributes” is a 45-minute Grade 3 plan for 3.G.A.1, timed section by section, with the misconceptions to expect and an exit ticket. Sort by Number of Sides is the practice that follows it.

More practice for 3.G.A.1

Group shapes by what they have in common.

Teaching this next? Sorting Shapes by Shared Attributes is the 45-minute plan for it, with the misconceptions to expect.

All Grade 3 worksheets

Last reviewed 2026-09-05. Aligned to 3.G.A.1 of the Common Core State Standards for mathematics.