1.Read the protractor. Ray OA starts at 0° on the right. What is the angle?
A125°
B50°
C135°
D130°
Grade 4geometryOriginal practice
Geometry: Measuring and Classifying Angles
Read protractors and classify acute, right, and obtuse angles with structured practice.
New questions for the same learning goal. Choose “Save as PDF” in your browser’s print window to keep a copy.
Page layout
0 practice pages · 0 answer pages. Pages are added automatically when needed. Question content and answer keys stay together.
Sheet 5B082CCF · questions and answers share this IDOpen this sheet’s answers ↗
About this practice
Grade 4 · math · Matching answer key included · US Letter and A4
Preview the original practice
Downloads contain the original practice. Use the workbench above for new questions and custom printing.
Teaching guide, sample answers and curriculum references
Before you begin
Identify an angle's vertex and rays and place a ray on a protractor baseline.
How to use this worksheet
- Model the target skill: read a protractor from its zero-degree baseline. Use the first task as a guided example before asking for an independent response.
- Check readiness first: Identify an angle's vertex and rays and place a ray on a protractor baseline.
- Discuss an incorrect response using this distinction: Read the scale that begins at the aligned zero; the other scale may give the supplementary angle.
A common mistake to discuss
Read the scale that begins at the aligned zero; the other scale may give the supplementary angle.
What to practice next
Estimate whether an angle is acute or obtuse before checking the protractor reading.
Sample question and answer
Read the protractor. Ray OA starts at 0° on the right. What is the angle?
- A. 125°
- B. 50°
- C. 135°
- D. 130°
Answer: D. Start at the right-hand 0° baseline and read toward ray OB: 130°.
The corresponding diagram is shown in the practice preview and PDF.
Intended curriculum references: CCSS.MATH.CONTENT.4.MD.C.6 · CCSS.MATH.CONTENT.4.G.A.1. These references describe learning goals; they are not endorsements.
Published 2026-10-02; updated 2026-10-02. Original MakeWorksheet practice. Automated consistency checks support publication; independent subject-specialist review is not recorded. Read our editorial policy.
Continue practicing
Practice previewGrade 3
3.MD.C.7 Key
Geometry: Perimeter and Area of Polygons
Calculate perimeter by adding outer boundaries and area using base × height from labeled geometric polygon diagrams.
Generate new questions
Practice previewGrade 5
5.G.B.3 Key
Geometry: Circle Radius, Diameter, and Circumference Relationships
Calculate radius from diameter and diameter from radius using d = 2r. Authentic geometric circle diagrams with complete answer key.
Generate new questions
Practice previewGrade 5
5.G.A.1 Key
Geometry: Graphing Points on the Coordinate Plane
Plot and identify ordered pairs (x, y) on a Cartesian coordinate grid in Quadrant 1. Essential 5th grade geometry with step-by-step answer key.
Generate new questions
Practice previewGrade 5
5.MD.C.5 Key
Geometry & Measurement: Volume of Rectangular Prisms
Calculate cubic volume using V = length × width × height with authentic 3D diagrams and step-by-step answer key.
Generate new questions