Measurement- (Perimeter and Area) · B4 Mathematics

Lesson notes

Learning Objectives

Indicator: B4.3.3.1.1

By the end of the lesson, learners can:

Identify and use personal referents (e.g., thumb width for centimetre, arm span for metre) to estimate the perimeter of at least three classroom objects.
Estimate the perimeter of given objects in centimetres or metres before measuring.
Measure the actual perimeter of objects using a ruler or tape measure and record results in cm or m.
Compare estimated perimeter with actual measured perimeter and explain any differences.
Work collaboratively in pairs to estimate, measure, and verify perimeters of objects around the classroom.

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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: B4.3.3.1.1 - Estimate perimeter using referents for centimetre or metre
Suggested placement: Term 3, Week 3 (Week 27 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. 39
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1 Using pupils' referents for centimetre or metre estimate and calculate perimeter of any object in the classroom (e.g. exercise book, floor tiles, math set, etc.) then measure with a ruler of tape and calculate the actual perimeter and compare the answers

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