Grade 4
Types of Angles Worksheets
Acute, right, obtuse or straight — and working out the missing angle.
Free printable PDF · answer key included · new problems every time
Preview · page 1
- 1.Two angles together make a straight angle (180°). One angle measures 107°. How many degrees is the other angle? ___°
- 2.An angle measures 99°. Is it acute, right, obtuse or straight? (Answer: acute / right / obtuse / straight)
- 3.Two angles together make a straight angle (180°). One angle measures 86°. How many degrees is the other angle? ___°
- 4.Two angles together make a right angle (90°). One angle measures 27°. How many degrees is the other angle? ___°
- 5.Two angles together make a straight angle (180°). One angle measures 99°. How many degrees is the other angle? ___°
- 6.Two angles together make a right angle (90°). One angle measures 79°. How many degrees is the other angle? ___°
- 7.Two angles together make a straight angle (180°). One angle measures 76°. How many degrees is the other angle? ___°
- 8.An angle measures 180°. Is it acute, right, obtuse or straight? (Answer: acute / right / obtuse / straight)
- 9.Two angles together make a straight angle (180°). One angle measures 114°. How many degrees is the other angle? ___°
- 10.An angle measures 156°. Is it acute, right, obtuse or straight? (Answer: acute / right / obtuse / straight)
Show answers
1) 73 · 2) obtuse · 3) 94 · 4) 63 · 5) 81 · 6) 11 · 7) 104 · 8) straight · 9) 66 · 10) obtuse
How to explain it to your child
Name the four angle types by their degrees, then work out missing angles next to right and straight angles.
- Under 90° is acute, exactly 90° is right, between 90° and 180° is obtuse, exactly 180° is straight. — 40° → acute
- Two angles that make a right angle: subtract the known one from 90°. — 90° − 30° = 60°
- Two angles that make a straight angle: subtract from 180°. — 180° − 110° = 70°
Example: 30° and 60° make a right angle (90°); 110° and 70° make a straight angle (180°).
Every sheet has a QR code: if your child gets stuck, they scan it and get this explanation step by step — without giving the answer away.
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Questions parents ask
Are these types of angles worksheets really free?
Yes. Your first three downloads need no sign-up; after that a free account lets you print as many as you like. No subscription. Every PDF has an answer key at the back.
Can I get new problems once my child has done this sheet?
Yes. “New problems” makes a fresh sheet on the same topic every time — different numbers, same level.
How do I know which topic my child should practise?
Take the free 5-minute check: your child solves a few problems on the phone, and you get a printable workbook built for exactly their gaps.