Looking for favourite "rich tasks" from the NRICH collection?
These resources have been chosen because they are ideal for developing knowledge and understanding of Factors and Multiples.
![Factors and Multiples Game](/sites/default/files/styles/medium/public/thumbnails/content-id-5468-icon.png?itok=0fdeo2-b)
game
Factors and Multiples Game
A game in which players take it in turns to choose a number. Can you block your opponent?
![Dozens](/sites/default/files/styles/medium/public/thumbnails/content-98-03-six2-icon.png?itok=NzwxPabC)
![Divisibility Tests](/sites/default/files/styles/medium/public/thumbnails/content-97-01-art1-icon.gif?itok=tBfsJ5tk)
article
Divisibility Tests
This article explains various divisibility rules and why they work. An article to read with pencil and paper handy.
![Placeholder: several colourful numbers](/themes/nrich/images/nrich_small_placeholder.png)
list
Factors and Multiples - More Secondary resources
Some extra resources to support work on Factors and Multiples at Secondary level.
![American Billions](/sites/default/files/styles/medium/public/thumbnails/content-01-09-six5-icon.png?itok=jytZpqxV)
problem
American Billions
Play the divisibility game to create numbers in which the first two digits make a number divisible by 2, the first three digits make a number divisible by 3...
![Factors and Multiples Puzzle](/sites/default/files/styles/medium/public/thumbnails/content-id-5448-icon.png?itok=OmzhsOJB)
problem
Factors and Multiples Puzzle
Using your knowledge of the properties of numbers, can you fill all the squares on the board?
![Sieve of Eratosthenes](/sites/default/files/styles/medium/public/thumbnails/content-id-7520-icon.jpg?itok=Lg5WVm6M)
problem
Sieve of Eratosthenes
Follow this recipe for sieving numbers and see what interesting patterns emerge.
![Take Three From Five](/sites/default/files/styles/medium/public/thumbnails/content-03-10-six3-icon.png?itok=W75fA1WM)
problem
Take Three From Five
Caroline and James pick sets of five numbers. Charlie tries to find three that add together to make a multiple of three. Can they stop him?
![Stars](/sites/default/files/styles/medium/public/thumbnails/content-id-2669-icon.png?itok=Ez9pJPne)
problem
Stars
Can you work out what step size to take to ensure you visit all the dots on the circle?
![Product Sudoku](/sites/default/files/styles/medium/public/thumbnails/content-id-4903-icon.png?itok=VQGPrcYI)
problem
Product Sudoku
The clues for this Sudoku are the product of the numbers in adjacent squares.