Types of angles worksheets
Sorting angles into acute, right, obtuse and straight, and estimating their size.
Download the free types of angles worksheet (PDF)
Types of angles worksheet
What’s on the worksheet
- 50 questions on types of angles, sized for US Letter paper
- 4 pages of questions plus an answer key on the last page
- Written for grade 4, matching Common Core 4.G.A.1, 4.MD.C.5
- Name and date lines at the top, and room to show the work
Sample questions from this worksheet
- An angle measuring 34° is:
- An angle measuring 177° is:
- An angle measuring 180° is:
- An angle measuring 68° is:
- An angle measuring 60° is:
- An angle measuring 90° is:
Preview the worksheet and answer key
Make a new types of angles worksheet
Need another page for extra practice, a retake or a second group in class? The free Mathify Kids test maker builds a fresh types of angles worksheet with different numbers every time. Choose Core, Standard or Challenge level, print it with its own answer key, or let your child take it on screen and see the score straight away.
Types of angles: a worked example (Name 35°, 90°, 120° and 180°)
- 35° is less than 90°: acute.
- 90° is exactly a square corner: right. 120° is between 90° and 180°: obtuse.
- 180° is a straight line: straight.
How to use it at home and in class
At home
Use the corner of a sheet of paper as a right-angle checker. Ten problems a day works better than a whole sheet at once. Mark them together with the answer key, then ask your child to explain one they got wrong: finding the mistake themselves is where the learning happens.
In class
Use the first row as a warm-up, a full page for independent practice, or five questions as an exit ticket. For a retake or a second group, make a new version with the test maker so every child gets different numbers.
Mistakes to watch for
- Judging an angle by the length of its arms.
- Calling any angle that looks big obtuse without comparing it to a right angle.
What to practice before and after types of angles
- Before: naming 2d shapes. If this sheet is a struggle, go back a step.
- After: perimeter, once this one is mostly right.
- Learn it first: the types of angles lesson and the angles chart.
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Questions parents ask
How do you tell an acute angle from an obtuse one?
Compare it with a square corner. Smaller than a square corner is acute; bigger is obtuse.
What grade is this types of angles worksheet for?
It is written for grade 4 and matches Common Core standards 4.G.A.1, 4.MD.C.5.
Can I get a different version of this types of angles worksheet?
Yes. Use the free Mathify Kids test maker to make a new types of angles worksheet with different numbers every time, at Core, Standard or Challenge level, with its own answer key.