Finding Missing Angles
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Finding Missing Angles
Finding missing angles worksheet: six pairs of angles side by side that make a right angle, a straight angle or an angle given. Subtract to find each missing angle. Grades 4 and 5, with an answer key.
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- Skill
- Angles Worksheets
- Pages
- 1
- Last updated
- Time
- About 15 minutes
- Answer key
- Included
- Printing
- Black and white
- Related curriculum
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Name angles as acute, right, obtuse or straight by comparing them with a right angle, measure and draw angles in degrees with a protractor, and find a missing angle when two angles make a larger one.
Reviewed by Mrs. Catherine Reynolds, Teacher. How we check worksheets
How to use this sheet
- Have the child decide whether each angle is acute, right or obtuse before measuring it. The measurement should agree.
- Show how to line up the protractor: the small mark in the middle of the straight edge on the vertex, and the zero line on one arm.
- For missing angles, have the child write the equation, such as 90 − 35, before working it out.
Common mistakes
- Reading the wrong scale on the protractor, so a 40 degree angle is read as 140. Check: is the angle acute or obtuse?
- Thinking an angle with longer arms is bigger. Only the turn between the arms matters.
- Placing the corner or the edge of the protractor on the vertex, instead of the mark in the middle of its straight edge.
