Input Output Tables

Input and Output Tables

Essential Question: how can you write a rule to describe a pattern in a table?

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​Learning Objective: You will determine and apply a rule to describe a pattern in a table.

​Remember...

​An input/output table shows pairs of related values.

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​The rule for the table tells how each input value is changed to find its output value.

​Unlock the Problem

​Diane enjoys saving money with store coupons. On Monday, she received a coupon for $8 off any $40 or more purchase at her favorite store.

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​You can use an input/output table to find a rule that relates the amount of purchase to the final cost.

Fill in the Blanks

Step 1: Describe the pattern.

The final cost is $8 (greater or less) than the amount of purchase.

Fill in the Blanks

Step 2: Find a rule.

Rule: (Add/Subtract/Multiply/Divide) $8 from the amount of purchase.

Fill in the Blanks

Step 3: Use your rule to find the final cost of a purchase of $117.

The final cost is $117 -

.

Fill in the Blanks

The final cost is $117 - $8.

So, the final cost of a $117 purchase is

.

(Don't forget to type your dollar sign!)

Multiple Choice

What is the rule for the table shown?

• Add 3 to the input to get the output.

• Subtract 3 from the input to get the output.

• Multiply the input by 3 to get the output.

• Divide the input by 3 to get the output.

Multiple Choice

What is the rule for this table?

• r divided by 2

• r multiplied by 2

• r plus 2

• r minus 2

Multiple Choice

What is the rule for this table?

• Add 5 to the input

• Subtract 4 from the input

• Multiply the input by 4

• Divide the input by 5

Multiple Choice

What is the rule for this table?

• Add 3 to the input

• Subtract 5 from the input

• Multiply the input by 2

• Divide the input by 4

Multiple Choice

What number should replace the question mark?

• 50

• 18

• 20

• 10