Measurement - Length, Mass, Time · B3 Mathematics

Lesson notes

Learning Objectives

Indicator: B3.3.3.1.1 - Model and describe the relationship between the units metre and centimetre

By the end of the lesson, learners can:

Explain that 1 metre (m) is equal to 100 centimetres (cm) and model this using a metre rule and a 100 cm tape measure.
Identify and name objects in the classroom and around the school that measure approximately 1 cm and approximately 1 m in length.
Read the calibration marks on a ruler, metre rule and tape measure, identifying where 1 cm, 10 cm, 50 cm and 100 cm are located.
Convert simple measurements between metres and centimetres (e.g., 2 m = 200 cm, 300 cm = 3 m) using the 1 m = 100 cm relationship.
Compare the lengths of two objects by converting both measurements to the same unit (either cm or m) and stating which is longer.

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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: B3.3.3.1.1 - Model and describe the relationship between the units metre and centimetre
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 1-3), 2019, p. 67
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Guide learners to study the calibration on the tape measure, metre rule and ruler
E.g. 2. Identify objects that measure approximately 1 cm or 1m; Estimating the length of given objects using these base objects as a reference point or point of comparison
E.g. 3. Identify the appropriate standard unit (cm or m) for measuring the length of a given object
E.g. 4. Estimate, then measure, using a ruler and recording the length and width of 2 D shapes or the length, width and height of given 3D objects
E.g. 5. Draw a line segment of a given length with a ruler, grid paper etc.
E.g. 6. Demonstrate the relationship between 100 cm and 1 m using concrete materials