Measurement- (Perimeter and Area) · B4 Mathematics

Lesson notes

Learning Objectives

Indicator: B4.3.3.1.2 - Measure and record perimeter for regular and irregular shapes in cm and m.

By the end of the lesson, learners can:

Measure the sides of a given regular shape using a ruler in centimetres and record each measurement accurately.
Measure the sides of a given irregular shape using a ruler in centimetres and record each measurement accurately.
Calculate the perimeter of regular and irregular shapes by adding the lengths of all their sides.
Measure the sides of larger shapes in metres using a metre rule or tape measure and record the perimeter in metres.
Record perimeter measurements correctly using the units cm and m, and justify their choice of unit for a given shape.

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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: B4.3.3.1.2 - Measure and record perimeter for regular and irregular shapes in cm and m.
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. 39
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1 Ask pupils to use a ruler to measure all the sides of a regular shape and sum up the result to obtain the perimeter P = 16cm

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: DO; 3 cm; A; 5 cm; B; Find the Perimeter; 5cm; 3cm; length=5cm; width=3cm; P = 5cm + 3cm + 5cm + 3cm = (16cm); Formula: P = 21 + 2w.

E.g. 2 Pupils to explore the area of irregular cut-out shapes using graph sheets. Pupils to trace the shape on the graph sheet and count out the unit squares
E.g. 3 Given an irregular shape with its sizes, ask pupils to sum up the sizes to obtain the perimeter.