This is my favourite cool maths resource of all time. I have said before that worksheets are your tools. A worksheet does not make a good teacher any more than a hammer makes a good builder. I was a bit skeptical when I looked at the Making Math Fun series. The last thing I need as a relief teacher is a time-waster. These Cool Math Games had me at "Hello". But it gets better. Theresa (the author) will keep sending you free stuff all the time. This is a resource that just keeps giving.