Addition of Logs Inquiry Prompt

A little inquiry task to arrive at the addition rule for logs.  It is nice to let pupils attempt each of the tasks and then let them direct a whole class discussion.  This approach allows more mathematical thinking than simply telling them the rule.  A suggested next step would be to have pupils explore “why” the rule works.  Encouraging pupils to consider the exponential form of the expressions is a useful starting point. 

Credit:  @chrismcgrane84

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