Counting, Representation… · B4 Mathematics

Lesson notes

Learning Objectives

Indicator: B4.1.1.3.2 - Determine the highest common factor (HCF) of any two whole numbers between 1 and 50.

By the end of the lesson, learners can:

list all the factors of any two whole numbers between 1 and 50.
identify the common factors shared by two given whole numbers.
determine the highest common factor (HCF) of two whole numbers between 1 and 50 by listing factors.
use a Venn diagram to find the HCF of two whole numbers between 1 and 50.
solve simple word problems involving HCF in everyday situations.

Sign in with your phone number to read the full note and download the GES plan - free.

Sign in with phone number

Curriculum details

Strand: Number (Strand 1)
Sub-strand: Counting, Representation & Cardinality (1.1)
Content standard: B4.1.1.3 - Demonstrate an understanding of factors, multiples and squared numbers
Indicator: B4.1.1.3.2 - Determine the highest common factor (HCF) of any two whole numbers between 1 and 50.
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.
Curriculum reference: Mathematics Curriculum for Primary Schools (Basic 4-6), 2019, p. 10
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1 Learners list the factors of two or more given whole numbers; 12 and 24 to list the factors. That is: 12 = {1, 2, 3, 4, 6, 12}and 24 = {1, 2, 3, 4, 6, 8, 12, 24} Learners determine the set of the common factors E.g. The common set factors of 12 and 24 = { } 1 , 2 , 3 , 4 , 6 , 12 . Learners select the highest common factor of 12 and 24 as 12
E.g. 2 Learners may use Venn diagrams to find the common factors and then the highest common factor by placing the factors in the regions of the shapes. The highest common factor of 12 and 20, in the diagram is 4 Note: Do not introduce formal set theory and notation. Numbers in the common regions of the two shapes.

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: E.g. 2; Learners may use Venn diagrams to find the; common factors and then the highest common; factor by placing the factors in the regions of the; shapes. The highest common factor of 12 and 20; in the diagram is 4; Factors of 20; 5; 10;.