A directory of useful objects found on the web for teaching Maths.
http://aperiodical.com/2017/01/mobile-numbers-products-of-twin-primes/
Investigation
Katie Steckles investigates a property of twin primes using the spreadsheet on her phone.
This might be an interesting extension activity for a class investigating prime numbers.
25 January 2017 Edit: 25 January 2017
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