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LCM (Least Common Multiple)

Mathematics JSS 1 Week WEEK 2 Preview
Lesson Details (Preview)

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Date: N/A

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Duration: 40 minutes

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Sub-topic: N/A

Learning Objectives (Preview)

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

  1. Find LCM of two or more numbers by listing multiples.
  2. Find LCM using prime factorisation.
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.
+3 more steps in full version

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