Skill: Complete simple input-output tables

Explanation and Free Practice Resources

An input-output table represents a consistent relationship in which the same simple rule connects each whole-number input to its output. The learner applies or identifies rules such as adding or subtracting a small number to complete missing entries and verify the pattern across rows, using familiar whole numbers; variables, negative numbers, multiplication or division rules, and formal function notation are not included.

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Detailed Explanation: Complete simple input-output tables

An input-output table follows the same rule in every row. To complete it:

Compare an input and its output.
Find the rule, such as “add $4$ .”
Use the rule to find the missing number.
Check that the rule works in every row.

Example:

Input	Output
$1$	$5$
$2$	$6$
$3$	$\square$
$4$	$8$

Look at the first row:

1+4=5

Check the next row:

2+4=6

So the rule is add $4$ . Use the rule for the missing row:

3+4=7

The completed table is:

Input	Output
$1$	$5$
$2$	$6$
$3$	$7$
$4$	$8$

The rule works for every row: add $4$ to the input.

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Input/Output Tables (Add/Subtract) - Table with Gap to Missing Value

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