Unexpected Ordering
Age 5 to 7
Challenge Level
Watch the video of Fran re-ordering these number cards. What do you notice? Try it for yourself. What happens?
Eightness of Eightlive
Age 5 to 7
Challenge Level
What do you see as you watch this video? Can you create a similar video for the number 12?
Next-door Numbers
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?
Ring a Ring of Numbers
Age 5 to 7
Challenge Level
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
Digit Addition
Age 5 to 11
Challenge Level
Try out this number trick. What happens with different starting numbers? What do you notice?
Strike it Out
Age 5 to 11
Challenge Level
Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.
Dotty Six
Age 5 to 11
Challenge Level
Dotty Six is a simple dice game that you can adapt in many ways.
Seeing Squares
Age 5 to 11
Challenge Level
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
School Fair Necklaces
Age 5 to 11
Challenge Level
How many possible symmetrical necklaces can you find? How do you know you've found them all?
Magic Vs
Age 7 to 11
Challenge Level
Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?
Number Differences
Age 7 to 11
Challenge Level
Place the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?
Surprising Split
Age 7 to 11
Challenge Level
Does this 'trick' for calculating multiples of 11 always work? Why or why not?
Subtraction Surpriselive
Age 7 to 14
Challenge Level
Try out some calculations. Are you surprised by the results?
Consecutive Numbers
Age 7 to 14
Challenge Level
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
NRICH is part of the family of activities in the Millennium Mathematics Project.