Drag the numbers to the right place in the Venn Diagram.
Jul 302020
Sep 262015
How well do you know your prime numbers? Challenge your friends to this Sporcle quiz!
Sep 072013
Have a go at this worksheet to find all the Prime Numbers less than 100.
Now try this much bigger Sieve to find all the Prime Numbers less than 400! Start by clicking on 2 and all the multiples of 2 will be removed. Then click on 3 to remove the multiples of 3 and continue clicking on the prime numbers until you are only left with red prime numbers.
Also take a look at this video
Apr 172013
Here is a great starter from Transum
http://www.transum.org/Software/SW/Starter_of_the_day/starter_April14.asp
Mar 022013
Here are two clear examples showing how to find the prime factors of a number.
May 162012
Here’s another great starter from Transum
http://www.transum.org/software/SW/Starter_of_the_day/Students/Venn_Diagram.asp
Oct 302011
A factor is a number that divides into another number without a remainder. So the factors of 15 are 1, 3, 5 and 15.
The multiples of 4 are all the numbers in the 4 times table. 4,8,12,16,20,24,28,32……..
A prime number is special because it only has 2 factors. These two factors are always 1 and the number itself. So 7 is a prime number because the factors of 7 are 1 and 7.