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Brian's input-output table with four pairs of numbers and multiple-choice options to determine the correct mathematical rule.

$A math problem showing Brian's input-output table with inputs 30, 60, 20, 40 and outputs 20, 50, 10, 30, asking which rule was used.$

A math problem showing Brian's input-output table with inputs 30, 60, 20, 40 and outputs 20, 50, 10, 30, asking which rule was used.

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Show Answer Key & Explanations Step-by-step solution for: New York State Tests: 4th Grade Math 2010 | Gary Rubinsteins Blog

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Let’s look at the table:

Input → Output
30 → 20
60 → 50
20 → 10
40 → 30

We need to find a rule that works for all of these.

Try each option:

A: Add 10
30 + 10 = 40 → but output is 20 → ✘
So not A.

B: Add 30
30 + 30 = 60 → output is 20 → ✘
Not B.

C: Subtract 10
30 - 10 = 20 ✔
60 - 10 = 50 ✔
20 - 10 = 10 ✔
40 - 10 = 30 ✔
All match! ✔️

D: Subtract 20
30 - 20 = 10 → but output is 20 → ✘
Not D.

Only C works for every row.

Final Answer: C

Parent Tip: Review the logic above to help your child master the concept of test for 4th grade math worksheet.

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