Summary
Math Antics finds the least common multiple using prime factorization. A clear, animated 5-minute lesson you can drop straight into a grade 6 math block -- pause-friendly, with worked examples on screen.
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All ages
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Teaching resources
Discussion questions
Discussion
A few questions to talk through after watching “LCM: Prime Factorization Method.”
- How do prime factors help you build the LCM?
- Why do you take the highest power of each prime?
- How is this faster than listing multiples for big numbers?
Quick work-a-long
Vocabulary: prime factor, multiple, least common multiple, exponent.
Try it: Use prime factorization to find the LCM of 12 and 18.