What is 7 raise to 1 by 3 divided by 7 raise to 1 by 5?
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Step-by-step explanation:
The Problem
Think of the number 71999. Now think of it after it has been multiplied out. What is its unit digit?
Teaching sequence
Introduce the problem to the class. Check that the students understand how to raise a number to a power and how to find a power using calculator functions.
Brainstorm ways to solve the problem.
As the students work on the problem, either individually or in small groups, check that they are recording their solutions in ways that will enable them to look for patterns. Try to avoid telling them to look for a pattern in the digits.
Share solutions.
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