Maths Warm-Up: Guess My Rule

The Sydney Teacher Blog

Maths Warm-Up: Guess My Rule

Welcome to the Monday Morning Maths Club!

Every Monday, I share a free, no-prep maths activity that’s quick, fun, and classroom-ready.

Today’s pick? A super engaging warm-up your students will love! Guess My Rule.

Guess My Rule

Guess My Rule is one of those games that hooks students from the first round. It’s interactive, quick to set up, and brilliant for building number sense in a fun way.

How It Works

The teacher writes several number pairs on the board for the class to see. Students study the pairs carefully, try to figure out the pattern or connection between the numbers, and then explain how one number changes into the other, sharing their reasoning with the class.

For Example:

The teacher writes:

2 → 6  
4 → 12  
5 → 15

Students look at the numbers and notice that each first number is multiplied by 3 to get the second number. They then explain: “The rule is multiply by 3.”

Why It's So Good

• Quick and low prep, just write number pairs on the board

• Engages students’ thinking and reasoning skills

• Encourages class discussion and explanation

• Flexible, can adjust difficulty for different year levels

• Helps identify which students understand patterns and connections

• Fun and interactive, keeps students focused in the first few minutes of class

Give Guess My Rule a try and watch your students light up as they think, talk, and grow in confidence with maths.

 

Resource Library

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