Even and Odd
Age 5 to 7
Challenge Level
This activity is best done with a whole class or in a large group. Can you match the cards? What happens when you add pairs of the numbers together?
Double or Halve?
Age 5 to 7
Challenge Level
Throw the dice and decide whether to double or halve the number. Will you be the first to reach the target?
Catrina's Cards
Age 5 to 7
Challenge Level
How would you find out how many football cards Catrina has collected?
Our Numbers
Age 5 to 7
Challenge Level
These spinners will give you the tens and unit digits of a number. Can you choose sets of numbers to collect so that you spin six numbers belonging to your sets in as few spins as possible?
Are You Well Balanced?
Age 5 to 7
Challenge Level
Can you work out how to make each side of this balance equally balanced? You can put more than one weight on a hook.
Clapping Times
Age 5 to 7
Challenge Level
If you count from 1 to 20 and clap more loudly on the numbers in the two times table, as well as saying those numbers loudly, which numbers will be loud?
Birthday Sharing
Age 5 to 7
Challenge Level
It's Sahila's birthday and she is having a party. How could you answer these questions using a picture, with things, with numbers or symbols?
Tables Teaser
Age 5 to 7
Challenge Level
How will you work out which numbers have been used to create this multiplication square?
Share Bears
Age 5 to 7
Challenge Level
Yasmin and Zach have some bears to share. Which numbers of bears can they share so that there are none left over?
Two Numbers Under the Microscope
Age 5 to 7
Challenge Level
This investigates one particular property of number by looking closely at an example of adding two odd numbers together.
Always, Sometimes or Never?live
Age 5 to 11
Challenge Level
Are these statements relating to odd and even numbers always true, sometimes true or never true?
Ip Dip
Age 5 to 11
Challenge Level
"Ip dip sky blue! Who's 'it'? It's you!" Where would you position yourself so that you are 'it' if there are two players? Three players ...?
Growing Garlic
Age 5 to 11
Challenge Level
Ben and his mum are planting garlic. Can you find out how many cloves of garlic they might have had?
Magic Plant
Age 5 to 7
Challenge Level
On Friday the magic plant was only 2 centimetres tall. Every day it doubled its height. How tall was it on Monday?
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.
How Odd
Age 5 to 7
Challenge Level
This problem challenges you to find out how many odd numbers there are between pairs of numbers. Can you find a pair of numbers that has four odds between them?
The Amazing Splitting Plant
Age 5 to 7
Challenge Level
Can you work out how many flowers there will be on the Amazing Splitting Plant after it has been growing for six weeks?
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?
The Tomato and the Bean
Age 5 to 7
Challenge Level
At the beginning of May Tom put his tomato plant outside. On the same day he sowed a bean in another pot. When will the two be the same height?
Lots of Lollies
Age 5 to 7
Challenge Level
Frances and Rishi were given a bag of lollies. They shared them out evenly and had one left over. How many lollies could there have been in the bag?
Odd Times Even
Age 5 to 7
Challenge Level
This problem looks at how one example of your choice can show something about the general structure of multiplication.
NRICH is part of the family of activities in the Millennium Mathematics Project.