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Area of rectangles and triangles

Mathematics

Area of rectangles and triangles

An AR classroom game for Grade 5. Learners can aim with their hands at the camera or play by tapping the screen.

This set has 6 questions in an interactive multiple choice activity.

Curriculum indicatorค 2.1 ป.5/2

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. A rectangle 4 by 7 - what is its area?

    • 28
    • 11
    • 22
    Read the explanation

    The area of a rectangle is width times length: four times seven is twenty-eight square units.

  2. A square with sides of 6 - what is its area?

    • 24
    • 36
    • 12
    Read the explanation

    A square has equal sides, so its area is side times side: six times six is thirty-six.

  3. A triangle with base 8 and height 5 - what is its area?

    • 40
    • 13
    • 20
    Read the explanation

    A triangle's area is half of base times height: eight times five is forty, and half of that is twenty.

Before you play

Game teaching guide

What children will practise

Practise the area of rectangles, squares and triangles (half of base times height), tell area apart from perimeter, and work back from a square's area to its side, in line with ค 2.1 ป.5/4 on perimeter and area of quadrilaterals.

What's in the worksheet

6 questions, multiple choice with 3 options - Area of a 4 by 7 rectangle (28) - Area of a triangle with base 8 and height 5 (20) - Perimeter of a 3 by 9 rectangle (24) - A square of area 49 square units: how long is each side (7)

How to use it in class

Use after teaching the triangle area formula, as an end-of-lesson check; about 6-8 minutes. - Play solo on tablets to see who still forgets to halve - After Q4, pause and ask whether it asked for area or perimeter; contrast a fence round a field with the grass inside it - If many miss Q3 or Q5, draw a rectangle and cut it along a diagonal to show the triangle is half of it - Play it linked to the class to record results in the mark book.

Common sticking points

- Q3 and Q5: forgetting to halve gives 40 and 60, both offered as distractors - Q4 asks for perimeter but children multiply 3 × 9 = 27 out of habit; underline the word perimeter - Q2: some give 24 for a square of side 6 (6 × 4 is the perimeter) - Q6: guessing 8 or 9; recite 7 × 7, 8 × 8 and 9 × 9 before playing

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

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Area of rectangles and triangles — AR game for Grade 5 | Krufahda