Measurement · B5 Mathematics

Lesson notes

Indicator: B5.3.2.1.2 - Calculate perimeter of given shapes in centimetres and metres.

By the end of the lesson, learners can:

Define perimeter as the total distance around a 2-D shape.
Calculate the perimeter of rectangles, squares and triangles by adding the lengths of all sides.
Convert between centimetres and metres when stating perimeter answers.
Solve word problems involving perimeter in real-life situations.
Justify their answers by showing clearly how they added the side lengths.

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Strand: Geometry and Measurement (Strand 3)
Sub-strand: Measurement (3.2)
Content standard: B5.3.2.1 - Estimate and measure perimeter and surface area of 2-D shapes using centimetre and metre
Indicator: B5.3.2.1.2 - Calculate perimeter of given shapes in centimetres and metres.
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. 98
Transcribed from the official NaCCA publication. Check this page against the source.

E.g. 1 Give learners 2D shapes with given dimensions to find the perimeter by adding the distance around the shapes