Find an unknown angle — Guided Practice — page 1
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Find an unknown angle — Guided Practice — page 2
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Worksheet directions

Grade 4 • Guided Practice • Work with your teacher or a partner. Discuss the model or strategy, then complete each problem.

Sample questions

  1. A 120° angle is split into adjacent, non-overlapping parts. One is 45°. Find the other. Write an equation with x. Equation: ___ x = ___ degrees
  2. A 150° angle is split into adjacent, non-overlapping parts. One is 60°. Find the other. Write an equation with x. Equation: ___ x = ___ degrees
  3. A 90° angle is split into adjacent, non-overlapping parts. One is 40°. Find the other. Write an equation with x. Equation: ___ x = ___ degrees
  4. A 120° angle is split into adjacent, non-overlapping parts. One is 55°. Find the other. Write an equation with x. Equation: ___ x = ___ degrees
  5. A 90° angle is split into adjacent, non-overlapping parts. One is 30°. Find the other. Write an equation with x. Equation: ___ x = ___ degrees
  6. A 180° angle is split into adjacent, non-overlapping parts. One is 75°. 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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