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Kinds of angle

Mathematics

Kinds of angle

An AR classroom game for Grade 4. Learners can aim with their hands at the camera or play by tapping the screen.

This set has 4 rounds in an interactive sorting activity.

Curriculum indicatorค 2.2 ป.4/1

PlayHost a classroom

A look before you play

Sample questions

A few real prompts from the game to help you choose an activity for your class.

  1. Sort these angles into groups.

    Sort into

    • acute angle
    • obtuse angle
    • 30 degrees
    • 120 degrees
    • 75 degrees
    • 150 degrees
    Read the explanation

    An acute angle is under ninety degrees; an obtuse angle is over ninety but under one hundred and eighty.

  2. Sort these shapes by their number of sides.

    Sort into

    • 3 sides
    • 4 sides
    • equilateral triangle
    • square
    • right-angled triangle
    • rectangle
    Read the explanation

    Count the sides: a triangle has three, a quadrilateral has four.

  3. Sort these fractions into groups.

    Sort into

    • less than a half
    • more than a half
    • 1/4
    • 3/4
    • 2/8
    • 5/6
    Read the explanation

    Compare with a half: if the top is more than half the bottom, the fraction is more than a half.

Before you play

Game teaching guide

What children will practise

Classify angles given in degrees as acute or obtuse (indicator ค 2.2 ป.4/1), with review of counting sides, comparing fractions with a half, and numbers that divide exactly by 5.

What's in the worksheet

4 sorting questions with 2 boxes each - 30 and 75 degrees are acute; 120 and 150 degrees are obtuse - Equilateral and right-angled triangles have 3 sides; square and rectangle have 4 - 1/4 and 2/8 are less than a half; 3/4 and 5/6 are more - 25 and 40 divide exactly by 5; 32 and 17 do not

How to use it in class

Use after measuring angles with a protractor, about 5 minutes, solo mode. - For angles, before revealing, have pupils draw 75 and 120 degrees with a real protractor - 2/8 is the interesting fraction; notice that it equals 1/4 - Q2 and Q4 are quick basic review - Play it linked to the class to record results in the mark book

Common sticking points

- Putting 75 degrees under obtuse because it seems a fairly big number. Always compare with 90 - Putting 2/8 under more than a half, or being unsure. Half of 8 is 4, and 2 is less than 4 - Getting 5/6 and 3/4 right without knowing why. Ask what half of 6 is

Play together first, then build on it with a worksheet for the same level.

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