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CCSS 8.F.1 Worksheets

CCSS 8.F.1 (Common Core, 8th Grade): "Understand that a function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output." The worksheets below practice this standard. Each one is a free printable PDF with an answer key, comes in multiple versions, and can also be assigned digitally - no login or account needed.

Functions Define, evaluate, and compare functions. 1Understand that a function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output.

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CCSS 8.F.1 Worksheets - Identify Functions (Equations) worksheet

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Identify Functions (Equations)

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Decide whether an equation is a function by checking if each input has exactly one output.
Tell the difference between a function and a non-function when equations have x and y variables.

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CCSS 8.F.1 Worksheets - Identify Functions (Graphs) worksheet

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Identify Functions (Graphs)

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Decide whether a graph represents a function by checking if each x-value matches only one y-value.
Use the vertical line test to spot graphs that are not functions.
Identify repeated x-values on a graph and explain why that breaks the function rule.

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CCSS 8.F.1 Worksheets - Identifying Functions (Tables) worksheet

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Identifying Functions (Tables)

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Decide whether an input-output table is a function by checking if each input has exactly one output.
Spot when a table is not a function because the same input is paired with different outputs.

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CCSS 8.F.1 Worksheets - Identifying Points of a Function in a Graph worksheet

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Identifying Points of a Function in a Graph

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Decide whether a given point could be on the same function shown in a graph.
Connect a point on a graph to an input-output pair for the function.

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CCSS 8.F.1 Worksheets - Identifying Points of a Function in a Table worksheet

Load up one problem at a time! Ideal for projectors, tablets and computers.

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Identifying Points of a Function in a Table

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Decide whether a given point could belong to the same function shown in the table.

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CCSS 8.F.1 Worksheets - Identifying Tables from a Function worksheet

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Identifying Tables from a Function

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Practice matching a function equation to the correct table of x and y values
Plug x values into a given equation to check if the y values in each table are correct
Work with different types of functions including addition, multiplication, and combinations of both

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