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.
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 .
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