Find an unknown angle — Review — page 1
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Find an unknown angle — Review — page 2
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Worksheet directions

Grade 4 • Review • Choose a strategy for each problem. Explain or check your thinking where requested.

Sample questions

  1. A 130° angle is split into adjacent, non-overlapping parts. One is 40°. Find the other. Write an equation with x. Equation: ___ x = ___ degrees
  2. A 90° angle is split into adjacent, non-overlapping parts. One is 35°. Find the other. Write an equation with x. A student adds 90 + 35. Explain why that counts the known part twice. Equation: ___ x = ___ degrees
  3. A 180° angle is split into adjacent, non-overlapping parts. One is 75°. Find the other. Write an equation with x. Equation: ___ x = ___ degrees
  4. A 90° angle is split into adjacent, non-overlapping parts. One is 25°. Find the other. Write an equation with x. Equation: ___ x = ___ degrees
  5. A 160° angle is split into adjacent, non-overlapping parts. One is 85°. Find the other. Write an equation with x. Equation: ___ x = ___ degrees
  6. A 140° angle is split into adjacent, non-overlapping parts. One is 50°. Find the other. Write an equation with x. Equation: ___ x = ___ degrees

See the preview for diagrams, answer spaces, and the complete layout.

Common Core connections

Source labels: 4.MD.C.7. Review the learning goals below to check the fit for your class.

  • 4.MD.C.7 — Use angle addition to find unknown angles

Bring it into your lesson

Review the preview and question content above. Open the resource in Sparkclass to copy it to your Files and use it in your workspace. Check the resulting layout before sharing it with students.

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