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Next-door Numbers
Light the Lights
How Would We Count?
Square Surprise
Pouring Problem
Consecutive Numbers
Subtraction Surprise
Surprise!
Surprise!
Curiosity is triggered when something unexpected happens. These problems aim to draw students in by offering that element of surprise.
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Next-door Numbers Age 5 to 7Challenge Level 
Age 5 to 7
Challenge Level
Florence, Ethan and Alma have each added together two 'next-door' numbers. What is the same about their answers?
Light the Lights Age 5 to 7Challenge Level
Age 5 to 7
Challenge Level
Investigate which numbers make these lights come on. What is the smallest number you can find that lights up all the lights?
How Would We Count? Age 5 to 11Challenge Level
Age 5 to 11
Challenge Level
An activity centred around observations of dots and how we visualise number arrangement patterns.
Square Surprise Age 5 to 11Challenge Level
Age 5 to 11
Challenge Level
Why do you think that the red player chose that particular dot in this game of Seeing Squares?
Pouring Problem Age 7 to 11Challenge Level
Age 7 to 11
Challenge Level
What do you think is going to happen in this video clip? Are you surprised?
Consecutive Numbers Age 7 to 14Challenge Level
Age 7 to 14
Challenge Level
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
Subtraction Surprise Age 7 to 14Challenge Level
Age 7 to 14
Challenge Level
Try out some calculations. Are you surprised by the results?