A Venn Diagram is a powerful visual way to show the factors of a number, and the common factors of two numbers. Nice implementation.
Here is the home page for this activity
The learning activity can be found at:
Here are the comparable Venn Diagram resources for multiples:
And the learning resource
Four activities to support the teaching and learning of Factors and Multiples.
The Factor Game
Highest Common Factor Game
Factors and Multiples Puzzle (from NRich)
There is a cool puzzle at the Nrich website called the Factors and Multiples Puzzle, which can be found on-line at http://nrich.maths.org/public/viewer.php?obj_id=5448
I have created a flipchart to support the use of this puzzle in the classroom. Enjoy!
Choose your starting number. Then click repeatedly on only those ghosts which are multiples of that number. How long does it take to reach 100?
Prime Factors Calculator
The Nth Prime Number
An interactive 100 square. You can choose to start the square with either 0 or 1.
You can also change the 'width' of the 100 board using this link:
Here is a different 100 square. Clink on the IDEAS button to see how you might use this tool.
Click on two cards to turn them over. If they match, they are cleared from the board. If not, they remain on the board. How many turns will it take you to clear the board? But there is a twist - you also have to click on the 'odd number out'!
A highly interactive Promethean ActivBoard flipchart where students discover the prime numbers, factors of numbers and the Highest Common Factor using a game based on Eratosthenes Sieve. Three thumbs up!
The flipchart can be found here:
If you are not yet a member of Promethean Planet, you will first have to register here:
If you want to view the activities and have some interactivity with them, but you don't have the ActivStudio software, you can download the free Viewer from here:
Join together cogs of different sizes and investigate what happens when you turn them. From the NRich website.