📐 Angles: Acute, Right and Obtuse

Worksheets › Grade 4 › Numbers & maths

About this grade 4 worksheet

Free 4th grade angles worksheet: classify each angle as acute, right, obtuse or straight, and estimate its size in degrees. Answer key included. Skill: Classifying and measuring angles. Level: Grade 4 — also suits Year 5 (UK).

For teachers: skills & standards

• CCSS 4.MD.C.5: Understand angles and angle measurement
• CCSS 4.G.A.1: Draw and identify lines and angles (right, acute, obtuse)
• Works as a morning-work page, a centre/station activity, homework or an early-finisher task.

Frequently asked questions

Is this worksheet free?

Yes — it is free to print for home or the classroom. Sign in with a free Pagine account, then use the Print button or save it as a PDF.

What age is it for?

It is designed for Grade 4 (ages 9–10), but use it with any child who is ready.

What skills does it build?

Classifying and measuring angles.

Where can I find grade 4 books to read with it?

Pagine's free library has 20,000+ children's books you can read in the Pagine e-reader or the free Pagine app — sorted by age and grade, with free audiobooks too.

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