Measurement- (Perimeter and Area) · B4 Mathematics

Lesson notes

Learning Objectives

Indicator: B4.3.3.2.3 - Estimate area by using referents for cm² or m²

By the end of the lesson, learners can:

Use a known referent, such as an exercise book cover, to estimate the area of classroom objects in square centimetres (cm²).
Use a known referent, such as a floor tile or desk top, to estimate the area of larger surfaces in square metres (m²).
Compare their estimates with actual measured areas and explain any differences between the two.
Justify their choice of referent when estimating the area of a given surface.
Work collaboratively in pairs or small groups to estimate and verify areas of objects found in their classroom and school environment.

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Curriculum details

Strand: Geometry and Measurement (Strand 3)
Sub-strand: Measurement- (Perimeter and Area) (3.3)
Content standard: B4.3.3.2 - Demonstrate an understanding of area of regular and irregular 2-D shapes
Indicator: B4.3.3.2.3 - Estimate area by using referents for cm 2 or m 2
Suggested placement: Term 3, Week 6 (Week 30 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. 42
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1 Let pupils estimate the area of items in the classroom. Then measure the actual area and compare with their estimates
E.g. 2 Pupils to measure the area of say their exercise books. With that as a reference point, ask them to estimate the area of the teacher's table