# Factors and Multiples - Secondary Resources

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.

### Dozens

##### Stage: 2 and 3 Challenge Level:

This problem offers a twist on the usual way of thinking about divisibility tests.

### Stars

##### Stage: 3 Challenge Level:

This problem encourages students to see the maths underpinning a situation. In this case it is the importance of factors and multiples in what is at first glance a geometrical setting.

### Factors and Multiples Game

##### Stage: 2, 3 and 4 Challenge Level:

This game can replace standard practice exercises on finding factors and multiples.

### Factors and Multiples Puzzle

##### Stage: 3 Challenge Level:

This puzzle provides an interesting context which challenges pupils to apply their knowledge of the properties of numbers.

### Sieve of Eratosthenes

##### Stage: 3 Challenge Level:

This problem offers students opportunities to explore the connection between primes and multiples.

### American Billions

##### Stage: 3 Challenge Level:

This is an engaging context in which to reinforce rules of divisibility and challenge students to reason mathematically and work systematically.

### Take Three from Five

##### Stage: 4 Challenge Level:

This problem offers students the opportunity to explore properties of multiples and remainders.

### Product Sudoku

##### Stage: 3 Challenge Level:

This problem offers an engaging context in which to apply knowledge of factors, multiples and prime factor decomposition.

### Factors and Multiples - More Secondary Resources

##### Stage: 3 and 4

Some extra resources to support work on Factors and Multiples at Secondary level.