Preview: LCM (Least Common Multiple)

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Lesson Details (Preview)

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Duration: 40 minutes

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Learning Objectives (Preview)

By the end of the lesson, students should be able to:

Rationale (Preview)

LCM is used in real life for scheduling events, finding common denominators, and solving problems involving cycles.

Presentation Steps (Preview)

Step / Time	Teacher's Activities	Student's Activities	Learning Points
Introduction (5 min)	Write: 'Multiples of 3: 3, 6, 9, 12, 15, …'. Ask: 'Multiples of 4: 4, 8, 12, 16, …'. Ask: 'What is t [Preview only]	Students identify 12 as the common multiple. They practice finding common multiples for Ex 2.	LCM is the smallest positive number that is a multiple of two or more numbers.
Step 1 (10 min)	Give pairs: (6,8), (4,6), (3,5). 6: 6,12,18,24,30…; 8: 8,16,24,32… → LCM = 24. 4: 4,8,12,16,20…; 6: [Preview only]	Students list multiples and find LCM in pairs. They present answers on mini-boards.	Listing multiples is a straightforward method, but can be lengthy for large numbers.
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