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Angle Addition - Worksheet 9 - 4th Grade

Hard

Read angles in degrees, classify them and add adjacent angle measures.

hard: Use another set to practice explaining and checking your answers.

18 problems · 15-20 minutes · Skills: angles, addition, subtraction

About This Worksheet

This hard-level worksheet contains 18 problems designed for 4th Grade students practicing angle addition. Hard worksheets feature challenging problems including multi-step questions, missing values, and real-world applications to push students further.

Read labeled dimensions and coordinates. Recall multiplication facts and length units.

  • Read angles in degrees, classify them and add adjacent angle measures.
  • Check your result using the method in the example before moving to the next question.

How to Solve: Worked Example

Example Problem: Ray OB lies inside angle AOC. Angle AOB is 62° and angle BOC is 30°. Find angle AOC.
Solution Steps:
  1. Adjacent angles add to make the whole angle.
Answer: 92 degrees
Tip: Check your result using the method in the example before moving to the next question.
1
Ray OB lies inside angle AOC. Angle AOB is 16° and angle BOC is 79°. Find angle AOC.
2
Ray OB lies inside angle AOC. Angle AOB is 37° and angle BOC is 34°. Find angle AOC.
3
Ray OB lies inside angle AOC. Angle AOB is 72° and angle BOC is 16°. Find angle AOC.
4
Ray OB lies inside angle AOC. Angle AOB is 72° and angle BOC is 73°. Find angle AOC.
5
Ray OB lies inside angle AOC. Angle AOB is 42° and angle BOC is 14°. Find angle AOC.
6
Ray OB lies inside angle AOC. Angle AOB is 16° and angle BOC is 41°. Find angle AOC.
7
Ray OB lies inside angle AOC. Angle AOB is 54° and angle BOC is 62°. Find angle AOC.
8
Ray OB lies inside angle AOC. Angle AOB is 40° and angle BOC is 73°. Find angle AOC.
9
Ray OB lies inside angle AOC. Angle AOB is 27° and angle BOC is 36°. Find angle AOC.
10
Ray OB lies inside angle AOC. Angle AOB is 62° and angle BOC is 58°. Find angle AOC.
11
Ray OB lies inside angle AOC. Angle AOB is 39° and angle BOC is 12°. Find angle AOC.
12
Ray OB lies inside angle AOC. Angle AOB is 50° and angle BOC is 76°. Find angle AOC.
13
Ray OB lies inside angle AOC. Angle AOB is 50° and angle BOC is 14°. Find angle AOC.
14
Ray OB lies inside angle AOC. Angle AOB is 68° and angle BOC is 16°. Find angle AOC.
15
Ray OB lies inside angle AOC. Angle AOB is 68° and angle BOC is 46°. Find angle AOC.
16
Ray OB lies inside angle AOC. Angle AOB is 57° and angle BOC is 17°. Find angle AOC.
17
Ray OB lies inside angle AOC. Angle AOB is 60° and angle BOC is 71°. Find angle AOC.
18
Ray OB lies inside angle AOC. Angle AOB is 35° and angle BOC is 44°. Find angle AOC.

Answer Key

1. 95 degrees2. 71 degrees3. 88 degrees4. 145 degrees5. 56 degrees6. 57 degrees7. 116 degrees8. 113 degrees9. 63 degrees10. 120 degrees11. 51 degrees12. 126 degrees13. 64 degrees14. 84 degrees15. 114 degrees16. 74 degrees17. 131 degrees18. 79 degrees

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Frequently Asked Questions

How do I download this angle addition - worksheet 9 worksheet?

Click "Download PDF" for a file, or "Print" to use your browser. You can save it as a PDF or print it directly. The answer key will be on a separate page.

How do I find worksheets at different difficulty levels?

Each subtopic has 10 worksheets: Worksheets 1-3 are Easy, 4-7 are Medium, and 8-10 are Hard. Start with Easy worksheets to build confidence, then progress to harder ones.

What skills does this angles worksheet cover?

This worksheet focuses on angles, addition, subtraction. It is designed for 4th Grade students and provides structured practice through varied problem types with a worked example to guide students before they begin.

Can I use this worksheet in my classroom?

Yes. All worksheets on K12Worksheets are free for classroom use. You can print copies for your entire class. With 10 worksheets per subtopic at three difficulty levels, you have plenty of options for differentiated instruction and individualized practice.

How many problems are on this worksheet?

This worksheet contains 18 problems. It typically takes 15-20 minutes to complete. An answer key with all solutions is included so parents and teachers can check work quickly.