Angles Game for Kids: Angle Ace
Angle Ace is a free geometry game where kids name types of angles, estimate angle sizes in degrees, and use angle facts to work out missing angles on a straight line, around a point and in a triangle.
Angle Ace
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- Ages
- 8–12
- School years
- 3rd Class–6th Class
- Skills
- Naming acute, right, obtuse, straight and reflex angles, Estimating angles in degrees using 90° and 180° as benchmarks, Knowing that angles on a straight line add up to 180°
- Curriculum
- Primary Curriculum
- Time
- 2–5 minutes a round
- Cost
- Free, no sign-up
- Updated
How to play Angle Ace
- Choose a level: angle types, estimate, missing angles or mixed.
- Compare each angle with a right angle (90°) and a straight line (180°).
- For missing angles, use the angle facts: 180° on a straight line, 360° around a point and 180° in a triangle.
- Answer 10 questions, build a streak and try to earn three stars.
What your child learns
- Naming acute, right, obtuse, straight and reflex angles
- Estimating angles in degrees using 90° and 180° as benchmarks
- Knowing that angles on a straight line add up to 180°
- Knowing that angles around a point add up to 360°
- Knowing that the angles in a triangle add up to 180°
- Subtracting to find a missing angle
About Angle Ace
Angles measure an amount of turn, and they are measured in degrees. This game starts by naming angle types: acute angles are less than 90°, right angles are exactly 90° (shown with a small square), obtuse angles are between 90° and 180°, straight angles are 180°, and reflex angles are more than 180°. The estimate level then asks kids to choose the closest size, using a right angle and a straight line as benchmarks. Every angle is drawn accurately.
The missing angles level uses three key facts. Angles on a straight line add up to 180°, angles around a point add up to 360°, and the three angles in a triangle add up to 180°. Kids subtract the known angles to find the missing one. Wrong answers include common slips, like using 360° instead of 180°. Angle types suit Classes 3–4, and missing angles suit Classes 5–6.
Which level should my child play?
| School year | Suggested level |
|---|---|
| 3rd Class | Angle types |
| 4th Class | Angle types, Estimate |
| 5th Class | Missing angles |
| 6th Class | Missing angles, Mixed |
Move up a level after getting three stars two or three times in a row.
🏆 Leaderboard
Full leaderboard →Play a round to get on the board! Create a free account to save your scores.
🇮🇪 Primary Curriculum links
Find games by class →- 4th Class · Stage 3 · Shape and Space: Identifying and classifying angles.
- 6th Class · Stage 4 · Shape and Space: Using angle facts to find missing angles.
Strands and strand units summarised from the Primary Mathematics Curriculum (2023) and the Primary Language Curriculum, published by the NCCA for the Department of Education (curriculumonline.ie). Both curricula set learning outcomes for two-year stages, so the class shown is our suggested starting point. Game alignment by Success Tutoring; not endorsed by the NCCA or the Department of Education.
📝 Use it for test prep
Angle Ace builds skills for these tests. Try the ⏱️ Timed test button for exam-style practice.
Frequently asked questions
What are the five types of angles?
Acute (less than 90°), right (exactly 90°), obtuse (between 90° and 180°), straight (exactly 180°) and reflex (between 180° and 360°).
How do you find a missing angle on a straight line?
Angles on a straight line add up to 180°. Add up the angles you know, then subtract the total from 180°. For example, if one angle is 130°, the other is 180° − 130° = 50°.
What age is this angles game for?
It suits children aged about 8 to 12. Start with angle types, then try estimating and missing angles.
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Practice at home is a great start. Success Tutoring offers personalised tutoring to build skills and confidence.