Free Grade 3 Working with Vertically Opposite Angles Common Errors Quizzes
Free Grade 3 quizzes for Working with Vertically Opposite Angles Common Errors: 12 real questions with a full answer key and worked solutions. Angles on a straight line add to 180°, around a point to 360°, and inside a triangle to 180°. A polygon with n sides has interior angles adding to (n − 2) × 180°.
Free
Stretch
30 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify working with vertically opposite angles common errors
Identify working with vertically opposite angles common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain working with vertically opposite angles common errors
Explain working with vertically opposite angles common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with vertically opposite angles common errors
Calculate working with vertically opposite angles common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with vertically opposite angles common errors
Compare working with vertically opposite angles common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
Prerequisites
Close these gaps first — each has its own free lesson, worksheet and quiz.
How Working with Vertically Opposite Angles Common Errors works
Angles on a straight line add to 180°, around a point to 360°, and inside a triangle to 180°. A polygon with n sides has interior angles adding to (n − 2) × 180°.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.Two angles on a straight line. One is 91°. Find the other.[1]
- 2.Two angles on a straight line. One is 29°. Find the other.[1]
- 3.Two angles on a straight line. One is 120°. Find the other.[1]
- 4.Two angles on a straight line. One is 116°. Find the other.[1]
- 5.A triangle has angles 80° and 20°. Find the third angle.[2]
- 6.A triangle has angles 53° and 23°. Find the third angle.[2]
- 7.A triangle has angles 72° and 46°. Find the third angle.[2]
- 8.A triangle has angles 36° and 69°. Find the third angle.[2]
- 9.Find the size of each interior angle of a regular 6-sided polygon.[3]
- 10.Find the size of each interior angle of a regular 10-sided polygon.[3]
- 11.Find the size of each interior angle of a regular 9-sided polygon.[3]
- 12.Find the size of each interior angle of a regular 5-sided polygon.[3]
Show answers and working
1. 89°
Angles on a straight line add to 180°. 180 − 91 = 89°.
2. 151°
Angles on a straight line add to 180°. 180 − 29 = 151°.
3. 60°
Angles on a straight line add to 180°. 180 − 120 = 60°.
4. 64°
Angles on a straight line add to 180°. 180 − 116 = 64°.
5. 80°
Angles in a triangle add to 180°. 180 − 80 − 20 = 80°.
6. 104°
Angles in a triangle add to 180°. 180 − 53 − 23 = 104°.
7. 62°
Angles in a triangle add to 180°. 180 − 72 − 46 = 62°.
8. 75°
Angles in a triangle add to 180°. 180 − 36 − 69 = 75°.
9. 120°
Sum of interior angles = (6 − 2) × 180 = 720°. Each angle = 720 ÷ 6 = 120°.
10. 144°
Sum of interior angles = (10 − 2) × 180 = 1440°. Each angle = 1440 ÷ 10 = 144°.
11. 140°
Sum of interior angles = (9 − 2) × 180 = 1260°. Each angle = 1260 ÷ 9 = 140°.
12. 108°
Sum of interior angles = (5 − 2) × 180 = 540°. Each angle = 540 ÷ 5 = 108°.
Worked examples
Two angles on a straight line. One is 45°. Find the other.
- Angles on a straight line add to 180°.
- 180 − 45 = 135°.
- Answer: 135°
A triangle has angles 61° and 51°. Find the third angle.
- Angles in a triangle add to 180°.
- 180 − 61 − 51 = 68°.
- Answer: 68°
Find the size of each interior angle of a regular 8-sided polygon.
- Sum of interior angles = (8 − 2) × 180 = 1080°.
- Each angle = 1080 ÷ 8 = 135°.
- Answer: 135°
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Reads the wrong scale on a protractor.
Correction: Start from the 0 on the arm you are measuring from.
Uses 360° for a triangle.
Correction: Triangle = 180°, quadrilateral = 360°.
Teacher tips
- · Estimate the angle type before measuring.
Parent tips
- · Spot right angles around the house.
Real-life applications
- · Ramps, clock hands, building and design.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
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Frequently asked
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- What should a learner already know before this?
- Start with Working with Vertically Opposite Angles Word Problems, Working with Vertically Opposite Angles Techniques, Introducing Vertically Opposite Angles. Each one has its own free lesson, worksheet and quiz.
- How is the quiz sequenced?
- Recognition first, then understanding, application, reasoning and finally mastery — the same ladder used across every free resource on the platform.
- What comes next after Working with Vertically Opposite Angles Common Errors?
- Move on to Introducing Vertically Opposite Angles, Vertically Opposite Angles in Context, which build directly on this idea.
Related resources
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