Prime Numbers Activity

Make your own prime number chart!

Click on any number, it will mark it gold (a possible prime number), and all its multiples blue (definitely composite numbers).

Keep marking numbers, until finally you will have a list of:

Oh, and 1 is neither prime nor composite, so you can't mark it.

 

Question: if you could choose "1", what would happen?

Question: do you have to continue marking the whole chart, or can you stop at some point?