Measurement - Length, Mass, Time · B3 Mathematics

Lesson notes

Learning Objectives

Indicator: B3.3.3.2.2 - Estimate masses and volumes using referents and verify by measuring, using a pan balance and weights, calibrated measuring cans.

By the end of the lesson, learners can:

Estimate the mass of a given object using a personal referent (such as a known weight of GHS 1 coin or a sachet of water) and record the estimate in kilograms or grams.
Verify mass estimates by measuring the actual object using a pan balance with standard weights, and record the measurement accurately.
Estimate the volume of a liquid or container using a referent (such as a standard drinking cup or a sachet of water) and record the estimate in litres or millilitres.
Verify volume estimates by measuring using calibrated measuring cans, and compare the estimate with the actual measurement.
Explain whether their estimate was close to the actual measurement and justify what made it accurate or inaccurate, using the language of comparison (heavier, lighter, more, less).

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Curriculum details

Strand: Geometry and Measurement (Strand 3)
Sub-strand: Measurement - Length, Mass, Time (3.3)
Content standard: B3.3.3.2 - Demonstrate an understanding of kilogram and gram (Kg, g) unit for measuring mass and millitre and litre (ml, l) for measuring capacity
Indicator: B3.3.3.2.2 - Estimate masses and volumes using referents and verify by measuring, using a pan balance and weights, calibrated measuring cans.
Suggested placement: Term 3, Week 7 (Week 31 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. 69
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Bring to class a collection of different types of objects and have learners estimate their weights or volumes using direct or indirect comparisons and then later verify the estimate by using standard measuring tools