While a stopped clock is right twice a day, a fast or slow clock confuses people for weeks. Scholars observe a clock running slow and must correct it before observing a clock running fast and working it backward. Finally, a multi-step problem relating a clock displaying an unbelievable time requires applying a new problem-solving strategy.

Concepts

clocks, analog clocks, digital clocks, telling time, time word problems

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Additional Tags

math

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Instructional Ideas

• Provide hands-on clocks for those who struggle with the concept
• Set up a time for pupils to teach how they solved these problems to younger students learning to tell time

Classroom Considerations

• Relies on prior knowledge of telling time on analog clocks

Pros

• Includes an answer key
• Works well in traditional or flipped classes

Cons

• None

Common Core

5.OA.B.3 6.EE.C.9 7.EE.B.3