Grade

4

# Guess My Rule: Number Pairs

- Some number pairs belong in the circles, and some do not.

What is the rule that decides what belongs in the red circle?

What is the rule to decide what belongs in the blue circle?

What is the rule to be in both circles? - Can you write a number pair that would go inside the intersection of the circles? How do you know?
- Write another number pair that belongs in only the red circle.
- Write another number pair that belongs in only the blue circle.
- Write a number pair that would go outside of the circles. How do you know?

- Try adding, subtracting, or multiplying the number pairs in the red circle. The answers to one of the operations will help you find the rule.
- What do you notice about the number pairs in the blue circle?

- Make your own rule, using numbers. You can use the circles below or draw your own.
- If possible, show some examples that belong inside each circle and some examples that don’t belong in either circle.

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Reference for Educators

Sample problems and solutions