Five Steps to 50
Age 5 to 7
Challenge Level
Use five steps to count forwards or backwards in 1s or 10s to get to 50. What strategies did you use?
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?
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.
Light the Lights
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?
More Numbers in the Ring
Age 5 to 7
Challenge Level
If there are 3 squares in the ring, can you place three different numbers in them so that their differences are odd? Try with different numbers of squares around the ring. What do you notice?
Digit Addition
Age 5 to 11
Challenge Level
Try out this number trick. What happens with different starting numbers? What do you notice?
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?
Tumbling Down
Age 7 to 11
Challenge Level
Watch this animation. What do you see? Can you explain why this happens?
Curious Number
Age 7 to 11
Challenge Level
Can you order the digits from 1-3 to make a number which is divisible by 3 so when the last digit is removed it becomes a 2-figure number divisible by 2, and so on?
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.
Subtraction Surpriselive
Age 7 to 14
Challenge Level
Try out some calculations. Are you surprised by the results?
Three Neighbours
Age 7 to 14
Challenge Level
Take three consecutive numbers and add them together. What do you notice?
NRICH is part of the family of activities in the Millennium Mathematics Project.