Wednesday, 2 October 2013

Finding prime numbers in Year 4

In Year 4 we've been looking at prime numbers this week.

Some of us have been out in the playground, using the hundred square there:

Here's a how we did it:

Later we had a go in the classroom, using a photo of the hundred square (16 colour bitmap format):

and, on Paint, filling he numbers in the 5, 3, 7 and 2 times table with colour:

And there we have it: the grey ones (except for 1) are the prime numbers!

(also blogged on the Year 4 blog)


  1. :-) :-) Wish I could put a 100 grid in the college parking lot! Will have to settle for online images. But... this is the last time I'm going to tolerate the thoroughly obnoxious Google Blogs captcha.

  2. Great lesson. The large color plastic pieces added an interesting element to the whole lesson. The kids seemed really engaged.