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Angle Addition - Worksheet 10 - 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 23° and angle BOC is 57°. Find angle AOC.
2
Ray OB lies inside angle AOC. Angle AOB is 13° and angle BOC is 17°. Find angle AOC.
3
Ray OB lies inside angle AOC. Angle AOB is 66° and angle BOC is 52°. Find angle AOC.
4
Ray OB lies inside angle AOC. Angle AOB is 33° and angle BOC is 51°. Find angle AOC.
5
Ray OB lies inside angle AOC. Angle AOB is 38° and angle BOC is 30°. Find angle AOC.
6
Ray OB lies inside angle AOC. Angle AOB is 26° and angle BOC is 42°. Find angle AOC.
7
Ray OB lies inside angle AOC. Angle AOB is 46° and angle BOC is 40°. Find angle AOC.
8
Ray OB lies inside angle AOC. Angle AOB is 17° and angle BOC is 78°. Find angle AOC.
9
Ray OB lies inside angle AOC. Angle AOB is 58° and angle BOC is 79°. Find angle AOC.
10
Ray OB lies inside angle AOC. Angle AOB is 49° and angle BOC is 31°. Find angle AOC.
11
Ray OB lies inside angle AOC. Angle AOB is 50° and angle BOC is 10°. Find angle AOC.
12
Ray OB lies inside angle AOC. Angle AOB is 78° and angle BOC is 70°. Find angle AOC.
13
Ray OB lies inside angle AOC. Angle AOB is 37° and angle BOC is 78°. Find angle AOC.
14
Ray OB lies inside angle AOC. Angle AOB is 49° and angle BOC is 79°. Find angle AOC.
15
Ray OB lies inside angle AOC. Angle AOB is 37° and angle BOC is 18°. Find angle AOC.
16
Ray OB lies inside angle AOC. Angle AOB is 14° and angle BOC is 70°. Find angle AOC.
17
Ray OB lies inside angle AOC. Angle AOB is 14° and angle BOC is 14°. Find angle AOC.
18
Ray OB lies inside angle AOC. Angle AOB is 38° and angle BOC is 28°. Find angle AOC.

Answer Key

1. 80 degrees2. 30 degrees3. 118 degrees4. 84 degrees5. 68 degrees6. 68 degrees7. 86 degrees8. 95 degrees9. 137 degrees10. 80 degrees11. 60 degrees12. 148 degrees13. 115 degrees14. 128 degrees15. 55 degrees16. 84 degrees17. 28 degrees18. 66 degrees

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Frequently Asked Questions

How do I download this angle addition - worksheet 10 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.