Measurement- (Perimeter and Area) · B4 Mathematics

Lesson notes

Learning Objectives

Indicator: B4.3.3.1.4 - Construct different rectangles for a given perimeter (cm, m) to demonstrate that many shapes are possible for a perimeter.

By the end of the lesson, learners can:

Recall the formula for the perimeter of a rectangle (P = 2 × (length + width)) and use it to check their work.
Find at least three different pairs of length and width that give the same given perimeter, such as a perimeter of 36 cm.
Construct and draw accurate rectangles on grid paper for a given perimeter, labelling the length and width of each side in cm or m.
Explain in their own words why many different rectangles can have the same perimeter, using examples they have drawn.
Solve a word problem involving a fixed perimeter in a real-life situation, such as fencing a plot or a garden, and present more than one possible rectangular design.

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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: B4.3.3.1.4 - Construct different rectangles for a given perimeter (cm, m) to demonstrate that many shapes are possible for a perimeter.
Suggested placement: Term 3, Week 5 (Week 29 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. 41
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Given a perimeter of say 36cm, pupils to draw about three different rectangular shapes for the same perimeter. Combinations may include (6cm, 6cm, 12cm, 12cm; 8cm, 8cm, 10cm, 10cm; 4cm, 4cm, 14cm, 14cm, etc.)