Angles worksheets
Aligned with Common Core 4.MD.C.5
Printable fourth-grade angle worksheets and how-to teaching pages: acute, right and obtuse angles, reading a protractor, measuring and drawing angles, and finding missing angles.
The worksheets
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How to Name Angles
The parts of an angle, acute, right, obtuse and straight angles, and turns in degrees.
Acute, Right or Obtuse?
Angles in many directions to sort. More adds straight angles.
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How to Use a Protractor
Reading a 50° angle on the outer scale and a 130° angle on the inner scale.
Read the Protractor
Protractors drawn on angles to read. Fewer uses tens, Standard uses fives on both scales, and More uses any whole degree.
Measure Angles
Angles to measure with a real protractor. Fewer uses tens, and Standard and More use fives in different directions.
Draw Angles
A ray and a measure to draw each angle with a protractor.
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How to Find a Missing Angle
Missing angles in a marked angle, on a straight line (180°) and in a square corner (90°).
Find the Missing Angle
Angles split into parts to find the missing one. Fewer uses marked angles and straight lines, Standard adds square corners, and More has three parts.
Print the whole packet
One copy of every sheet above, in order. Tap + for more copies (up to 10).
For the parent or teacher
What it is
An angle is two rays that share an endpoint, called the vertex. Angles are measured in degrees. A full turn is 360°, a right angle is 90° and a straight angle is 180°. Fourth graders sort angles as acute, right or obtuse, measure and draw angles with a protractor, and add or subtract angles to find a missing one.
What comes next
Lines and symmetry, including parallel and perpendicular lines.
How to teach it
- Use the corner of a sheet of paper as a 90° checker.
- Make angles with your arms or two pencils and name them.
- When using a protractor, decide first if the angle is acute or obtuse so you read the right scale.
- Line up the center mark exactly on the vertex and the 0 line on one ray.
- For missing angles, find the whole first. A straight line is 180° and a square corner is 90°.
Common mistakes
- Reading the wrong scale, like 130° for a 50° angle.
- Putting the edge of the protractor, not the center mark, on the vertex.
- Thinking longer rays make a bigger angle.
- Adding instead of subtracting to find a missing part.