Measurement - Length, Mass, Time · B3 Mathematics

Lesson notes

Learning Objectives

Indicator: B3.3.3.1.3 - Estimate lengths, heights and perimeter of regular and irregular shapes using referents and verify by measuring, using a ruler or tape.

By the end of the lesson, learners can:

Estimate the perimeter of regular and irregular shapes in centimetres and metres using personal referents such as hand spans, strides, and known lengths.
Measure the perimeter of regular and irregular shapes accurately using a ruler or measuring tape.
Compare estimated perimeters with measured perimeters and explain any differences.
Construct at least two different shapes that have the same given perimeter.
Explain the strategy used to find the perimeter of a given shape.

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Curriculum details

Strand: Geometry and Measurement (Strand 3)
Sub-strand: Measurement - Length, Mass, Time (3.3)
Content standard: B3.3.3.1 - Demonstrate an understanding of a metre and centimetre (cm, m) units for measuring length
Indicator: B3.3.3.1.3 - Estimate lengths, heights and perimeter of regular and irregular shapes using referents and verify by measuring, using a ruler or tape.
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 1-3), 2019, p. 68
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Measure and record the perimeter of a given regular or irregular shape and explain the strategy used
E.g. 2. Construct shapes for a given perimeter (cm or m); Construct more than one shape for the same given perimeter to demonstrate that many shapes are possible for a given perimeter
E.g. 3. Estimate the perimeter of a given shape (cm, m) using personal reference points for length, then measure to assess the accuracy of the estimation