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Measurement & Geometry

Grade 4 · Stretch challenge · 10 questions · Version PG-ECJDP3-5HDI

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1.Classify a 130° angle.
2.Reflect (9, 12) across the vertical line x = 16.
3.Classify a 100° angle.
4.Reflect (11, 10) across the vertical line x = 18.
5.Classify a 30° angle.
6.Reflect (3, 15) across the vertical line x = 7.
7.Classify a 60° angle.
8.Reflect (2, 6) across the vertical line x = 5.
9.Reflect (2, 10) across the vertical line x = 7.
10.Classify a 90° angle.

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 7
  1. Classify a 130° angle.Obtuse
  2. Reflect (9, 12) across the vertical line x = 16.(23, 12)
  3. Classify a 100° angle.Obtuse
  4. Reflect (11, 10) across the vertical line x = 18.(25, 10)
  5. Classify a 30° angle.Acute
  6. Reflect (3, 15) across the vertical line x = 7.(11, 15)
  7. Classify a 60° angle.Acute
  8. Reflect (2, 6) across the vertical line x = 5.(8, 6)
  9. Reflect (2, 10) across the vertical line x = 7.(12, 10)
  10. Classify a 90° angle.Right

Worked example

Sketch and label the quantities before selecting a measurement or geometry operation.

Common mistake

Using the right numbers with the wrong unit or formula.

Helpful hint

Write the unit beside every measurement.