Measuring angles
Measure angles in whole-number degrees using a protractor; draw given angles and sketch angles of specified measure
Lesson
Set out your lesson
“Measuring angles means practising the idea at the table with counters or paper models and one clear check. We will demo once, then your child tries.”
Bring to the table
- Paper shapes or a ruler and pencil
- Shape name cards
Extra for the adult
Worked example. A rectangle has four right angles. Naming the property is the check.
Optional challenge. For Measuring angles, add one harder example after success.
What to notice. Keep one parent note: examples tried; results; support used. This session samples Measuring angles, not mastery.
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Teaching approaches
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1 approach
Measuring angles means practising the idea at the table with counters or paper models and one clear check. We will demo once, then your child tries.
Materials: Paper shapes or a ruler and pencil; Shape name cards. Adult traces or shows one shape and names a property (sides/angles). Child identifies three shapes or measures one simple property and records it. Done: three correct shape/property responses. Stop after the fresh check; keep optional challenge for another day.
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Practice this concept
Start practiceMeasuring angles practice
Practice key ideas from Measuring angles.
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Learning resources
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Illustrative Mathematics · Practice link — not the full lesson
Measuring Angles
Before you open · source notes
Angles are measured in degrees with a protractor-style task. Supports measuring angles, not every angle-sum theorem.
Free, no sign-in. A teacher solution is on the same page, so use the student view with your child.
Before you openAsk for the measure of one drawn angle in degrees. Measuring once does not prove every triangle sum.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public Illustrative Mathematics task page. The .html address responds HTTP 308 to this URL. An anonymous GET of this URL on 2026-11-12 returned HTTP 200 with no login or payment prompt. Where a teacher solution is present, it is on the same page as the student task; this check did not find a separate locked student view. An adult can use the student view section and should not read a solution aloud. Advertising was not observed in the fetched HTML text; that is not a browser, device, or ad-free guarantee. This is a paper or discussion task, not an automatically marked interactive game. Opening the link does not save practice or assess mastery. Diagrams on the page use missing or filename-only alt text, so they are not an accessible image equivalent. Accessibility still depends on an adult describing the picture.
Illustrative Mathematics. “Measuring Angles.” Licensed CC BY-NC-SA 4.0. External task; Gakuva does not copy, host, embed, or redistribute it.
CC BY-NC-SA 4.0 — link only
Check understanding
- Measure an angle with a protractor and read 47°
- Draw an angle of 135° using a protractor
- Identify which scale on the protractor to use for an obtuse angle
“If your child is given a protractor and an angle drawn on paper, can they measure it accurately and then draw a new angle of a size you specify?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Geometry
- Age range
- Ages 9–12
Standards