Get the class's gears turning! Pupils first watch a video that introduces the situation: Given three gears, how many turns will it take for the dots shown on the gears to line up? They count the number of spurs on each gear, then use the least common multiple to find the answer.

Concepts

common multiples, least common multiple, gears, estimation

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Instructional Ideas

• Have scholars brainstorm other situations where applying the least common multiple would be beneficial
  

Classroom Considerations

• Learners should be familiar with multiples and least common multiples
• Familiarity with estimation is necessary
  

Pros

• Video makes the context more relatable
• Provides a solution
  

Cons

• None

Common Core

6.NS.B.4