★Classify Angles
Grade 5 Math Worksheet
NameDate
Write acute, right, obtuse or straight under each angle.
PencilGoGrade 5 · Math · Geometry
5th Grade Classify Angles worksheets
6 printable versionsOn LevelAbout 5 minutes eachFree · no account
When it’s done, scan the sheet with your phone and PencilGo marks it and picks the next one. Create a free account
★
Tired of searching for worksheets?
We’ll email one free Grade 5 worksheet every school day. Your child does it on paper. No account needed.
About this worksheet
Angles are named by their size: an acute angle is smaller than a right angle, a right angle measures exactly 90 degrees, an obtuse angle is bigger than a right angle but smaller than a straight line, and a straight angle is 180 degrees. On this fifth grade sheet a child sees twelve angles drawn with their measure written on them and writes the name of each one.
Because every angle has its measure printed, the work is knowing what the numbers mean, not guessing from the picture. Each version has different angles, and the answer key gives every name.
What your child will learn
- Know the size of a right angle
- Name acute and obtuse angles
- Recognize a straight angle
- Use the measure to classify
Common Core standard: 4.MD.C.5
Worked example
A 35-degree angle is smaller than 90 degrees, so it is acute. A 120-degree angle is obtuse.
Common mistake
Calling a 90-degree angle acute or obtuse; exactly 90 degrees is a right angle.
Helpful hint
Compare the measure with 90 and 180: less than 90 is acute, exactly 90 is right, between 90 and 180 is obtuse, 180 is straight.
Questions parents ask
What is the most common mistake with classify angles?
Calling a 90-degree angle acute or obtuse; exactly 90 degrees is a right angle.
How can I help my child with classify angles?
Compare the measure with 90 and 180: less than 90 is acute, exactly 90 is right, between 90 and 180 is obtuse, 180 is straight.
Are these 5th grade math worksheets free to print?
Yes. All 6 printable versions on this page are free to download and print, with no account needed.
Similar: Read Coordinates on a Grid · Coordinate Plane Problems
More 5th grade geometry
See all geometry
Every sheet you scan goes into your child’s record: dated, marked and ready for the year-end portfolio. Homeschool records