Counting, Representation… · B4 Mathematics

Lesson notes

Learning Objectives

Indicator: B4.1.1.3.3 - Determine the lowest common multiple (LCM) of at least any two given numbers up to 100.

By the end of the lesson, learners can:

List the set of multiples of any given number up to 100 using skip counting.
Identify common multiples shared by two given numbers within the range 0 to 100.
Determine the lowest common multiple (LCM) of two numbers up to 100 by selecting the smallest common multiple.
Justify their choice of LCM by explaining why no smaller common multiple exists.
Solve simple word problems involving LCM in everyday situations.

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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: B4.1.1.3.3 - Determine the lowest common multiple (LCM) of at least any two given numbers up to 100.
Suggested placement: Term 1, Week 6 (Week 6 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 identify and the list the set multiples of given numbers using skip counting E.g. The set of multiples 5 = { 5, 10 15……..100} and the etc. of multiples of 10 = {10, 20, 30 , ……..100}
E.g. 2 Learners list the set of common multiples of any two or more given numbers between 0 and 100.
E.g. The set of common multiples of 5 and 10 ={10, 20, 30, … 100}. Learners select the least of the common multiple of the given numbers, and identify the least common multiple (LCM). The LCM of 5 and 10 is 10.