Number Operations · B5 Mathematics

Lesson notes

Learning Objectives

Indicator: B5.1.2.6.1 - Solve simple addition and subtraction problems involving integers

By the end of the lesson, learners can:

Use a number line to add integers, including positive plus negative, negative plus positive, and negative plus negative.
Use a number line to subtract integers, including positive minus larger positive, negative minus positive, and negative minus negative.
Read and interpret integers above and below zero on a number line.
Solve simple word problems that require adding or subtracting integers in real-life situations.
Explain and justify their answers using the number line as evidence.

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Curriculum details

Strand: Number (Strand 1)
Sub-strand: Number Operations (1.2)
Content standard: B5.1.2.6 - Demonstrate understanding of integers
Indicator: B5.1.2.6.1 - Solve simple addition and subtraction problems involving integers
Suggested placement: Term 1, Week 11 (Week 11 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. 71
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Use number line to help learners to do the following types (addition) (1) 9 + -4 = _____ (2) -8 + 4 = _____ (3) -3 + -5 = _____ (4) 1 + -3 = _____ (5) -6 + 5 = _____ (6) 6 + -2 = _____ (7) -6 + 8 = _____ (8) -2 + 9 = ______

Wide colour mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions,... — A wide colour mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions, coloured regions. Visible labels, values, and notation include: 6+3=-3 +; 8; 7; 6-5; 6+(-3)=-9 <; 10-9; 21!1*; 2 -1; HФHHH+; 7 -6; 3 -2.

E.g. 2 Use number line to help learners to do the following types (subtraction) (9) -5 - 1 = ____ (10) -2 - 1 = ____ (11) 8 - 7= ____ (12) 2 - 6 = _____ (13) -1 - 7 = ____ (14) -5 - 7= ____ (15) -8 - 8= ____ (16) 4 - 6 = _____
E.g. 3. Solve word problems; e.g. (i) Some number added to 5 is equal to -11. Find the number. (ii) Ben and Cam are diving. Ben is 15.8 meters below the surface of the water. Cam is 4.2 meters above Ben What is Cam's position relative to the surface of the water?