Skip to content
LessonPrint

Which Shapes Belong Together? is a free printable Grade 3 maths worksheet on shapes sharing a defining 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.

Next set

One paper per pupil

12345678910111213141516171819202122232425

All 25 sets ask different questions.

Which Shapes Belong Together?

3.G.A.1

NameDate

Sort each one into the right box.

1.Sort each one into the right box.

Sort: trapezoid, regular pentagon, kite, rectangle

All sides equalSides not all equal
2.Sort each one into the right box.

Sort: kite, trapezoid, regular pentagon, rhombus

All sides equalSides not all equal
3.Sort each one into the right box.

Sort: regular octagon, trapezoid, rhombus, equilateral triangle

All sides equalSides not all equal
4.Sort each one into the right box.

Sort: kite, oblong, rectangle, rhombus

All sides equalSides not all equal
5.Sort each one into the right box.

Sort: rectangle, regular pentagon, square, regular octagon

All sides equalSides not all equal

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

Answer key — Which Shapes Belong Together?

Set 1. Prints on its own sheet.

  1. 1.All sides equal: regular pentagon; Sides not all equal: trapezoid, kite, rectangle
  2. 2.All sides equal: regular pentagon, rhombus; Sides not all equal: kite, trapezoid
  3. 3.All sides equal: regular octagon, rhombus, equilateral triangle; Sides not all equal: trapezoid
  4. 4.All sides equal: rhombus; Sides not all equal: kite, oblong, rectangle
  5. 5.All sides equal: regular pentagon, square, regular octagon; Sides not all equal: rectangle

Questions about Which Shapes Belong Together?

What does the Which Shapes Belong Together? worksheet cover?

It practises shapes sharing a defining 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 Which Shapes Belong Together? 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?

Which Shapes Belong Together? 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 Which Shapes Belong Together? 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 Which Shapes Belong Together? 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 Which Shapes Belong Together? free to print and photocopy?

Yes. Which Shapes Belong Together?, 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 3.G.A.1

Group shapes by what they have in common.

All Grade 3 worksheets

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