A directory of useful objects found on the web for teaching Maths.
Activity, Game, Interactive, Interesting, Tool
This site has one job: to tell you whether a given number is prime or not.
If you go to, for example, isthisprime.com/57, it will tell you that 57 is not a prime number.
There's an "Is this prime?" game as well.
2 September 2017 Edit: 4 September 2017
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