The learner identifies a consistent one-step rule connecting each input to its output, typically adding or subtracting a small whole number within 20, and uses the rule to complete missing entries or predict outputs. Input-output tables, arrow diagrams, and equations represent the same relationship; the focus is on preserving the rule across examples, not on formal function notation, multiplication-based rules, or rules involving larger or more complex numbers.
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Detailed Explanation: Find a simple input-output rule
Look at how each input changes to become its output. The same change should work every time.
Example:
| Input | Output |
|---|---|
Start with a pair you know:
So, the rule might be add .
Check the rule with another pair:
It works! Check one more:
It still works, so the rule is add .
Now use the rule for the missing output:
The missing output is .
Learn by doing: Find a simple input-output rule
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Practice with unlimited practice problems
Practice:
Input/Output Tables (Add/Subtract) - Full Table to Rule
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Download/Modify Free Grade 1 'Find a simple input-output rule' Worksheet
Print this free 'Find a simple input-output rule' worksheet to practice this skill away from the computer. Click 'Modify' to easily customize this worksheet to your exact needs.
This Worksheet Includes:
- Input/Output Tables (Add/Subtract) - Full Table to Rule
- Input/Output Tables (Add/Subtract) - Table with Gap to Rule
- Input/Output Tables (Add/Subtract) - Table with Gap to Missing Value
- Input/Output Tables (Add/Subtract) - Full Table and Rule to True/False
- Patterning - Concept Intro - Picture to Rule
- Patterning - Concept Intro - Type to Rule
- Patterning - Rule for Increasing Arithmetic Pattern
- Number Chart to 100 - Next/Previous Number (one, below 20)
Units Teaching This Skill
These adaptive units introduce, teach, or reinforce this skill (Find a simple input-output rule) through scaffolded problems that grow in difficulty as concepts are understood.