Measurement- (Perimeter and Area) · B4 Mathematics

Lesson notes

Learning Objectives

Indicator: B4.3.3.1.3 - Develop and apply a formula for determining perimeter of square and rectangle

By the end of the lesson, learners can:

Discover the perimeter formula for a rectangle (P = 2 × (length + width)) by adding the four sides of measured rectangles.
Discover the perimeter formula for a square (P = 4 × side) by adding the four equal sides of measured squares.
Apply the rectangle formula to find the perimeter when length and width are given in centimetres or metres.
Apply the square formula to find the perimeter when the side length is given in centimetres or metres.
Justify which method (adding sides or using a formula) is more efficient and explain why the formula works.

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Curriculum details

Strand: Geometry and Measurement (Strand 3)
Sub-strand: Measurement- (Perimeter and Area) (3.3)
Content standard: B4.3.3.1 - Demonstrate understanding of perimeter of regular and irregular shapes
Indicator: B4.3.3.1.3 - Develop and apply a formula for determining perimeter of square and rectangle
Suggested placement: Term 3, Week 4 (Week 28 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: Mathematics Curriculum for Primary Schools (Basic 4-6), 2019, p. 40
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Use cut out shapes to demonstrate how to determine the perimeter of 2-D shapes. Ask pupils to measure the sides of the cut out shape and add the results to obtain the perimeter

Nearly square colour mathematical teaching visual is organised as a table with horizontal divisions, vertical... — A nearly square colour mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions, coloured regions. Visible labels, values, and notation include: erimeter of square and rectangle; 5 cm; of; ape.

E.g. 2 Given a rectangular cut out shape, ask pupils to measure the sides of the shape and determine the perimeter of the shape Therefore the perimeter of the triangle given is AB + AD + BC + CD. Thus 4cm + 2cm + 4cm + 2cm = 12cm

Wide colour mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions,... — A wide colour mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions, coloured regions. Visible labels, values, and notation include: lape; 5 cm.