### There are 17 results

Broad Topics >

Numbers and the Number System > Prime numbers

##### Age 7 to 11 Challenge Level:

This problem is based on a code using two different prime numbers
less than 10. You'll need to multiply them together and shift the
alphabet forwards by the result. Can you decipher the code?

##### Age 7 to 11 Challenge Level:

These two group activities use mathematical reasoning - one is numerical, one geometric.

##### Age 7 to 11 Challenge Level:

Can you make square numbers by adding two prime numbers together?

##### Age 7 to 11 Challenge Level:

Using all ten cards from 0 to 9, rearrange them to make five prime
numbers. Can you find any other ways of doing it?

##### Age 7 to 14 Challenge Level:

Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.

##### Age 7 to 11 Challenge Level:

Work out Tom's number from the answers he gives his friend. He will
only answer 'yes' or 'no'.

##### Age 11 to 14 Challenge Level:

A man has 5 coins in his pocket. Given the clues, can you work out
what the coins are?

##### Age 7 to 11 Challenge Level:

Take the number 6 469 693 230 and divide it by the first ten prime
numbers and you'll find the most beautiful, most magic of all
numbers. What is it?

##### Age 7 to 11 Challenge Level:

What happens if you join every second point on this circle? How about every third point? Try with different steps and see if you can predict what will happen.

##### Age 7 to 11 Challenge Level:

Use the interactivities to complete these Venn diagrams.

##### Age 7 to 14 Challenge Level:

Factors and Multiples game for an adult and child. How can you make sure you win this game?

##### Age 11 to 14 Challenge Level:

Can you find a relationship between the number of dots on the
circle and the number of steps that will ensure that all points are
hit?

##### Age 7 to 11 Challenge Level:

This activity creates an opportunity to explore all kinds of number-related patterns.

##### Age 11 to 14 Challenge Level:

Using your knowledge of the properties of numbers, can you fill all the squares on the board?

##### Age 7 to 16 Challenge Level:

A game in which players take it in turns to choose a number. Can you block your opponent?

##### Age 11 to 14 Challenge Level:

Follow this recipe for sieving numbers and see what interesting patterns emerge.

##### Age 11 to 14 Challenge Level:

All strange numbers are prime. Every one digit prime number is
strange and a number of two or more digits is strange if and only
if so are the two numbers obtained from it by omitting either. . . .