CoStudyexam prep that shows its work
Open the study app

All certifications →Educational banks →

Home › Educational › Middle and elementary school › 3rd Math: Geometry

3rd Math: Geometry practice questions and exam guide

150 multiple-choice questions, 40 flashcards and 10 scenario simulations, written to the Common Core State Standards blueprint. Every question carries a full rationale.

Last reviewed 2026-10-26 · CoStudy · how we write and review questions

  • 200 total items
  • 150 multiple choice
  • 40 flashcards
  • 10 simulations

Study 3rd Math: Geometry in CoStudy →

About the 3rd Math: Geometry exam

Common Core State Standards (CCSS) — Mathematics, Grade 3: Geometry (3.G.A.1-2). Public standards from corestandards.org.

CoStudy's 3rd Math: Geometry bank holds 200 items. Every multiple-choice question carries a written rationale explaining why the correct answer is correct and why each distractor is tempting but wrong, and the bank includes 10 scenario-based simulations.

Free 3rd Math: Geometry practice questions

A sample of 12 multiple-choice questions from the bank, with the full rationale shown.

Which has curved edges?

  1. Hexagon
  2. Square
  3. Triangle
  4. Circle

Answer: D — Circle

D) Correct. B/C/A) straight sides.

Is every rectangle a square?

  1. Only tall ones
  2. Yes
  3. Sometimes
  4. No

Answer: D — No

D) Correct — rectangles may have unequal sides. B/C) wrong. A) wrong.

A candy bar divided into 4 equal parts. Kim eats 3. Fraction remaining?

  1. 3/4
  2. 1/4
  3. 4/3
  4. 4/4

Answer: B — 1/4

B) Correct — 1 of 4 left. A) eaten. C/D) reversed/whole.

A rhombus has:

  1. 4 equal sides
  2. 4 right angles
  3. 3 sides
  4. Curved sides

Answer: A — 4 equal sides

Rhombus = 4 equal-length sides. (B) is rectangle; (C),(D) wrong.

To find 1/4 of a shape, split it into how many equal parts?

  1. 1
  2. 2
  3. 8
  4. 4

Answer: D — 4

D) Correct — denominator = # of parts. B) that's for 1/2. C) 1/8. A) whole.

A pyramid with a square base has how many triangle faces?

  1. 4
  2. 3
  3. 5
  4. 6

Answer: A — 4

A) Correct — one per side of square. B/C/D) wrong.

A polygon is a:

  1. Closed figure with straight sides
  2. Curved shape
  3. 3D shape
  4. Letter

Answer: A — Closed figure with straight sides

Polygon = closed + straight sides. (B),(C),(D) wrong.

A rectangle divided into 3 equal parts. Each is:

  1. 1/2
  2. 3
  3. 1/3
  4. 3/3

Answer: C — 1/3

C) Correct. B) count. A) different. D) whole.

A whole is 6 equal parts. Each part is what fraction?

  1. 1/3
  2. 6
  3. 1/6
  4. 6/6

Answer: C — 1/6

C) Correct. B) count. A) 2/6. D) whole.

A square is split into 2 equal triangles by one diagonal. Each triangle is:

  1. The whole
  2. 1/4
  3. 1/2 of the square
  4. 2 wholes

Answer: C — 1/2 of the square

C) Correct. B) 4 parts. C/D) wrong.

Are all rhombuses also squares?

  1. Sometimes
  2. Yes
  3. No
  4. Only if drawn

Answer: C — No

C) Correct — rhombuses may not have right angles. B/C/D) wrong.

To divide a circle into 4 equal sectors, use:

  1. 1 line
  2. 2 diameter lines crossing at center
  3. 3 lines
  4. Random cuts

Answer: B — 2 diameter lines crossing at center

B) Correct — perpendicular diameters. A) 2 pieces. C) not equal. D) not equal.

3rd Math: Geometry flashcards

5 sample cards from the 40 in the bank.

What is an 'acute angle'?

An angle smaller than a right angle (less than 90°).

True or false: All rectangles are squares.

False. Most rectangles have unequal long and short sides — only the special ones with all equal sides are squares.

If a circle is split into 4 equal slices and 3 are eaten, what fraction is left?

1/4.

What is a quadrilateral?

Any 4-sided closed shape.

What is a 'regular polygon'?

A polygon where ALL sides and ALL angles are equal. Like a square, equilateral triangle, regular hexagon.

Practise the full 3rd Math: Geometry bank

These samples are a small slice. The full bank runs flashcards, multiple choice and timed mock exams with per-chapter progress tracking, on the web and in the iOS app.

Open 3rd Math: Geometry →

3rd Math: Geometry — frequently asked

What is the 3rd Math: Geometry exam?

Common Core State Standards (CCSS) — Mathematics, Grade 3: Geometry (3.G.A.1-2). Public standards from corestandards.org.

How is CoStudy’s 3rd Math: Geometry bank organised?

It holds 200 items (150 multiple-choice, 40 flashcards, 10 simulations). Free samples on this page include the full rationale, with no account.

Does CoStudy replace the certifying body?

No. the certifying body owns the outline, the badge, and the sitting rules. This is independent practice with written rationales. We do not sell live items and we do not guarantee a pass.

Where do 3rd Math: Geometry fees, cut scores, and pass rates live?

On the certifying body’s site. CoStudy will not invent a sitting fee or a pass rate. If a table on this page lacks a citation, treat it as unverified.

Are these real 3rd Math: Geometry exam questions?

No. CoStudy does not have live items. The samples below are original practice written to the published outline, with rationales. Anyone selling “real exam dumps” is describing something you should not buy.

Related study guides

Related subjects

Browse professional certification banks →