Prime numbers
game
Favourite
Dicey Array
Watch the video of this game being played. Can you work out the rules? Which dice totals are good to get, and why?
article
Public Key Cryptography
An introduction to coding and decoding messages and the maths behind how to secretly share information.
game
Factors and Multiples Game for Two
Factors and Multiples game for an adult and child. How can you make sure you win this game?
problem
Favourite
Sieve of Eratosthenes
Age
11 to 14
Challenge level
Follow this recipe for sieving numbers and see what interesting patterns emerge.
problem
Favourite
Number Families
Age
11 to 14
Challenge level
How many different number families can you find?
problem
HCF Expression
Age
11 to 14
Challenge level
Find out which two distinct primes less than $7$ will give the largest highest common factor of these two expressions.
problem
Three Primes
Age
14 to 16
Challenge level
Weekly Problem 6 - 2010
Can you find three primes such that their product is exactly five times their sum? Do you think you have found all possibilities?
Can you find three primes such that their product is exactly five times their sum? Do you think you have found all possibilities?
problem
Favourite
How much can we spend?
Age
11 to 14
Challenge level
A country has decided to have just two different coins, 3z and 5z
coins. Which totals can be made? Is there a largest total that
cannot be made? How do you know?