Counting

problem
Pairs of numbers

Age

5 to 7

Challenge level

If you have ten counters numbered 1 to 10, how many can you put into pairs that add to 10? Which ones do you have to leave out? Why?
problem
Sitting round the party tables

Age

5 to 11

Challenge level

Sweets are given out to party-goers in a particular way. Investigate the total number of sweets received by people sitting in different positions.
problem
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?
problem
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 ...?
problem
Colourful tiles

Age

11 to 14

Challenge level

Weekly Problem 21 - 2011
How many ways can you paint this wall with four different colours?
problem
Cube bricks and daisy chains

Age

5 to 7

Challenge level

Daisy and Akram were making number patterns. Daisy was using beads that looked like flowers and Akram was using cube bricks. First they were counting in twos.
problem
Sort them out (1)

Age

5 to 7

Challenge level

Can you each work out the number on your card? What do you notice? How could you sort the cards?
problem
Lots of biscuits!

Age

5 to 7

Challenge level

Help share out the biscuits the children have made.
problem
Fingers and hands

Age

7 to 11

Challenge level

How would you count the number of fingers in these pictures?
problem
Digit deletion

Age

11 to 14

Challenge level

What is the largest number of digits that could be erased from this 1000-digit number, to get a surprising result?