# Philip Dorrell's Math Activities

Here are some simple Javascript pages I have written which do different math activities.

- Sieve of Eratosthenes: Step through Eratosthenes' sieve algorithm for finding prime numbers. (This activity also demonstrates how you can use CSS floats to do a resizable number grid, similar to my Java-based IntegerZone.)
- Factorizer: Practice factorising numbers into their prime factors.
- PrimeShooterTM: An interactive 2D shooter game which tests your ability to factorise numbers into their prime factors. You have to shoot prime "bullets" at the numbers as they come down towards you.
- Cube Root Practice: Practice the algorithm for calculating the cube roots of 9 digit numbers in your head. It presents you with random cubes of 3 digit numbers, you enter the values for the digits of the answer one by one, and then it tells you if you got it right, and if you got it wrong, how you should have worked out the right answer.

If you are looking for help with algebra, you might be interested in my Algebra Help section.