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Grade 4 · unit review

Review: Measure and Combine Angles

Read ray turns, degree scales, adjacent angles, and unknown angle parts.

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Unit review questions
1. A full turn is split into 8 equal angle parts. How many degrees is one part?
Need a hint?
  • Use 360° as the full-turn benchmark.
  • Angle size measures turning, not the drawn ray lengths.
2. The starting ray aligns with Scale A’s zero. At the ending ray, A reads 70° and B reads 110°. What angle is measured?
Need a hint?
  • Choose the scale with zero on the starting ray.
  • A two-scale protractor does not mean both numbers measure the same chosen turn.
3. Two non-overlapping adjacent angle parts measure 39° and 43°. What is their combined measure?
Need a hint?
  • Use the common vertex and outside rays to identify the whole.
  • Direct addition assumes the angle interiors do not overlap.
4. A right angle is split into 53° and an unknown adjacent part. What is the unknown measure?
Need a hint?
  • Name the stated whole-angle benchmark before subtracting.
  • Do not assume a sketch is exactly to scale.

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

A right angle is split into adjacent parts measuring 37° and an unknown. Find the unknown and explain the check.

Work on paper or in your own document. Explain the choices you made.

  • Draw or label the numbers or shape features the task gives you.
  • Say why each calculation or shape choice follows the ideas in this unit.
  • Check that your answer fits the story or drawing in the task.
Compare with a model response

A right angle totals 90°, so the unknown is 90−37=53°. The two non-overlapping angles add to 37+53=90°. Ray length does not affect the degree measure.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.