It's not a time machine—it's a function machine! Using two rules, the video introduces a function machine that changes an input to an output. Pupils answer questions such as finding what is the input for a given output and what values provide an equal value after going through the function machine. 

Concepts

functions, function machine, inputs, algebraic expressions, inverse operations, function rule

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Additional Tags

math

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Instructional Ideas

• Pair classmates and have each create a function machine, but keep the rule secret. One provides an input and the other gives the output. The one giving the input tries to guess the function rule
• Provide students with practice using function machines

Classroom Considerations

• The class should be able to translate from words to algebraic expressions

Pros

• Begins with basic function machine questions and works toward more difficult ones
• Includes an embedded video along with one on YouTube

Cons

• None

Common Core

SL.9-10.2 8.F.A.1 HSF-IF.A.1 MP6