Number Lines
Age 5 to 7 Challenge Level:
Leah and Tom each have a number line. Can you work out where their counters will land? What are the secret jumps they make with their counters?
What Was in the Box?
Age 5 to 7 Challenge Level:
This big box adds something to any number that goes into it. If you know the numbers that come out, what addition might be going on in the box?
Secret Number
Age 5 to 7 Challenge Level:
Annie and Ben are playing a game with a calculator. What was Annie's secret number?
Stop the Clock
Age 5 to 7 Challenge Level:
This is a game for two players. Can you find out how to be the first to get to 12 o'clock?
The Tall Tower
Age 5 to 7 Challenge Level:
As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?
Growing Garlic
Age 5 to 7 Challenge Level:
Ben and his mum are planting garlic. Use the interactivity to help you find out how many cloves of garlic they might have had.
Doing and Undoing
Age 5 to 11 Challenge Level:
An investigation looking at doing and undoing mathematical operations focusing on doubling, halving, adding and subtracting.
Junior Frogs
Age 5 to 11 Challenge Level:
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?
Nim-7
Age 5 to 14 Challenge Level:
Can you work out how to win this game of Nim? Does it matter if you go first or second?
NRICH is part of the family of activities in the Millennium Mathematics Project.