Counting, Representation… · B3 Mathematics

Lesson notes

Learning Objectives

Indicator: B3.1.1.2.2 - Use real life contexts to deduce positive and negative number representations

By the end of the lesson, learners can:

Identify objects and situations that are above sea level and below sea level using a picture of the sea, mountains, and space.
Use the minus sign (-) to represent numbers below sea level and positive numbers to represent numbers above sea level.
Match given numbers (written with and without the minus sign) to the correct positions on a sea level number line.
Explain in their own words what a negative number means using a real life context such as the sea or the ground.
Sort a set of items found in Ghana into those found above sea level and those found below sea level, giving a reason for each choice.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Counting, Representation, Cardinality & Ordinality (1.1)
Content standard: B3.1.1.2 - Develop an understanding of positive and negative numbers
Indicator: B3.1.1.2.2 - Use real life contexts to deduce positive and negative number representations
Suggested placement: Term 1, Week 5 (Week 5 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.
Source document note: The official curriculum document has a fault in this entry, so the curriculum text above is transcribed exactly as printed:

exemplars - p.46
Curriculum reference: Mathematics Curriculum for Primary Schools (Basic 1-3), 2019, p. 46
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 3. Draw a large picture showing the sea, mountains above the sea and space below sea level. Provide pictures of items such as a fish, a whale, a boat, car, house, an octopus etc. Ask the learners where they would place each of the items on your picture. Encourage them to say "above the sea level" or "below the sea level". When all the items are stuck, discuss how high the plane might be and how low the octopus might be and so on. Introduce the "minus" sign to indicate under the sea level The document numbers this indicator's single exemplar E.g. 3, continuing the numbering of the indicator above it on the same page.